Document and Entity Information [Abstract] Document and Entity Information [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Trading Symbol Trading Symbol Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Entity Well-Known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Statement Of Financial Position [Abstract] Statement of Financial Position [Abstract] Assets [Abstract] ASSETS Property, Plant and Equipment, Net Investment in hotel, net Net Book Value Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Real Estate Investment Property, Net Investment in real estate, net Investment in real estate, net Assets Of Disposal Group, Including Discontinued Operation Properties held for sale Trading Securities Investment in marketable securities Other Investments Other investments, net Cash and Cash Equivalents, At Carrying Value Cash and cash equivalents Cash and cash equivalents Cash and cash equivalents at the beginning of the year Cash and cash equivalents at the end of the year Restricted Cash and Cash Equivalents Restricted cash Other Assets Other assets, net Total other assets Assets Total assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Accounts Payable and Accrued Liabilities Accounts payable and other liabilities Accounts Payable and Accrued Liabilities Current and Non Current Hotel Accounts payable and other liabilities - hotel Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for hotel services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. Due To Securities Broker Due to securities broker Carrying value of amount payable to securities broker as at the reporting date. Obligations For Securities Sold Obligations for securities sold Carrying value of obligations for securities sold as at the reporting date. Other Notes Payable Other notes payable Mortgage Notes Payable - Hotel Mortgage notes payable - hotel Carrying amount as of the balance sheet date of mortgage notes payable related to hotel property, plant and equipment. Mortgage Notes Payable - Real Estate Mortgage notes payable - real estate Carrying amount as of the balance sheet date of mortgage notes payable relating to real estate property. Mortgage Notes Payable - Property Held For Sale Mortgage notes payable - properties held for sale Carrying amount as of the balance sheet date of mortgage notes payable relating to property held for sale. Deferred Tax Liabilities Deferred income taxes Deferred income taxes Liabilities Total liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Stockholders Equity, Including Portion Attributable To Noncontrolling Interest [Abstract] Shareholders' equity: Preferred Stock, Value, Issued Preferred stock, $.01 par value, 100,000 shares authorized; none issued Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Ending Balance Common Stock, Value, Issued Common stock, $.01 par value, 4,000,000 shares authorized; 3,346,588 and 3,322,172 issued; 2,347,596 and 2,398,438 outstanding, respectively Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Additional Paid In Capital, Common Stock Additional paid-in capital Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Retained Earnings (Accumulated Deficit) Retained earnings Retained earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Treasury Stock, Value Treasury stock, at cost, 929,992 and 923,734 shares Treasury Stock, Value, Beginning Balance Treasury Stock, Value, Ending Balance Treasury stock, at cost, 998,992 and 923,734 shares Treasury stock, at cost, 929,992 and 923,734 shares Stockholders' Equity Attributable To Parent Total InterGroup shareholders' equity Total InterGroup shareholders' equity Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent, Ending Balance Stockholders Equity Attributable To Noncontrolling Interest Noncontrolling interest Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity, Including Portion Attributable To Noncontrolling Interest Total shareholders' equity Total shareholders' equity Balance Balance Liabilities and Equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical [Abstract] Condensed Consolidated Balance Sheet Parenthetical Preferred Stock, Par Or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred stock , shares issued Preferred Stock, Shares Issued, Total Common Stock, Par Or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Common Stock, Shares, Outstanding Common stock , shares outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Treasury Stock, Shares Treasury stock, shares Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Income Statement [Abstract] Income Statement [Abstract] Revenue, Net [Abstract] Revenues: Revenue From Hotels Hotel Hotel Real Estate Revenue, Net Real estate Real estate Revenue, Net Total revenues Total revenues Costs and Expenses [Abstract] Costs and operating expenses: Direct Costs Of Hotels Hotel operating expenses Hotel operations Hotel operating expenses Cost Of Real Estate Revenue Real estate operating expenses Real estate operations Real estate operating expenses Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization expense Depreciation and amortization Depreciation and amortization expense General and Administrative Expense General and administrative expense General and administrative General and administrative expense General and administrative expense Costs and Expenses Total costs and operating expenses Total costs and operating expenses Total costs and operating expenses Total costs and operating expenses Operating Income (Loss) Income (loss) from operations Income from operations Income from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Expense, Debt Interest expense Interest Expense, Debt, Total Interest expense Marketable Securities, Gain (Loss) Net (loss) gain on marketable securities Net (loss) gain on marketable securities Unrealized Gain Loss On Other Investments and Derivative Instruments Net unrealized (loss) gain on other investments and derivatives The net change during the reporting period between the fair value and carrying value of other investments. The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period, also includes unrealised gain or loss on derivative instruments. Unrealized (loss) gain on other investments and derivative instruments Impairment Loss On Other Investments Impairment loss on other investments Amount of impairment losses on other specified investments recognized in earnings during the reporting period. Impairment loss on other investments Investment Income, Interest and Dividend Dividend and interest income Dividend and interest income Interest Expense, Other Trading and margin interest expense Trading and margin interest expense Trading and margin interest expense Nonoperating Income (Expense) Other (expense) income, net Net other (expense) income Income (Loss) From Continuing Operations Before Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before income taxes Income (loss) before income taxes Income Tax Expense (Benefit) Income tax benefit (expense) Income tax (expense)benefit Income tax benefit (expense) Income tax benefit (expense) Income (Loss) From Continuing Operations, Including Portion Attributable To Noncontrolling Interest Income from continuing operations Income (loss) from continuing operations Income (Loss) From Discontinued Operations, Net Of Tax, Including Portion Attributable To Noncontrolling Interest [Abstract] Discontinued operations: Discontinued Operation, Income (Loss) From Discontinued Operation, Before Income Tax Income from discontinued operations Income from discontinued operations Gain (Loss) On Disposition Of Real Estate, Discontinued Operations Gain on sale of real estate Gain on the sale of real estate Gain on sale of real estate Discontinued Operation, Tax Effect Of Discontinued Operation Income tax expense Discontinued Operation, Tax Effect of Discontinued Operation, Total Income tax expense Income tax expense Income (Loss) From Discontinued Operations, Net Of Tax, Including Portion Attributable To Noncontrolling Interest Income from discontinued operations Income from discontinued operations Net Income (Loss), Including Portion Attributable To Noncontrolling Interest Net (loss) income Net (loss) income Net (loss) income Net income (loss) Net Income (Loss) Attributable To Noncontrolling Interest Less: Net income attributable to the noncontrolling interest (Income)loss attributable to the noncontrolling interest Less: Net income attributable to the noncontrolling interest Less: Net income attributable to the noncontrolling interest Net Income (Loss) Attributable To Parent Net income attributable to InterGroup Net (loss) income attributable to InterGroup Net Income (Loss) Per Share From Continuing Operations [Abstract] Net (loss) income per share from continuing operations Net Income (loss) Per Share From Continuing Operations Abtract Income (Loss) From Continuing Operations, Per Basic Share Basic (in dollars per share) Basic Income (Loss) From Continuing Operations, Per Diluted Share Diluted (in dollars per share) Diluted Net Income Per Share From Discontinued Operations [Abstract] Net income per share from discontinued operations Net Income Per Share From Discontinued Operations Income (Loss) From Discontinued Operations, Net Of Tax, Per Basic Share Basic (in dollars per share) Basic Income (Loss) From Discontinued Operations, Net Of Tax, Per Diluted Share Diluted (in dollars per share) Diluted Net Income (Loss) Per Share Attributable To Intergroup [Abstract] Net (loss) income per share attributable to InterGroup Net income(loss) per share attributable to InterGroup Earnings Per Share, Basic Basic (in dollars per share) Basic Earnings Per Share, Diluted Diluted (in dollars per share) Diluted Weighted Average Number Of Shares Outstanding, Basic Weighted average number of common shares outstanding (in shares) Weighted average number of common shares outstanding Weighted Average Number Of Shares Outstanding, Diluted Weighted average number of diluted common shares outstanding (in shares) Weighted average number of diluted common shares outstanding Statement Of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Statement, Equity Components [Axis] Common Stock [Member] Additional Paid-In Capital [Member] Retained Earnings [Member] Treasury Stock [Member] Parent [Member] Noncontrolling Interest [Member] Shares, Outstanding Balance (in shares) Balance (in shares) Balance (in shares) Stock Issued During Period, Value, New Issues Issuance of stock Stock Issued During Period, Shares, New Issues Issuance of stock (in shares) Stock Issued During Period, Value, Conversion Of Convertible Securities Conversion of RSU to stock Stock Issued During Period, Shares, Conversion Of Convertible Securities Conversion of RSU to stock (in shares) Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period Exercised, Number of Shares Exercise of stock options (in shares) Adjustments To Additional Paid In Capital, Share-Based Compensation, Stock Options, Requisite Service Period Recognition Stock options expense Stock Issued During Period Value Stock Options Exchanged For Stock Stock options exchanged for stock Value of stock issued pursuant to stock options exchanged for stock during the period. Stock Issued During Period Shares Stock Options Exchanged For Stock Stock options exchanged for stock (in shares) Number of shares of stock issued during the period pursuant to stock options exchanged for stock. Adjustments To Additional Paid In Capital, Share-Based Compensation, Other Long-Term Incentive Plans, Requisite Service Period Recognition Investment in Santa Fe Investment In Portsmouth Investment in Portsmouth This element represents the amount of recognized equity-based compensation related to other long-term incentive plans during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Investment in Portsmouth Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock Noncontrolling Interest, Decrease From Distributions To Noncontrolling Interest Holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to noncontrolling interest Statement Of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Net Cash Provided By (Used In) Operating Activities [Abstract] Cash flows from operating activities: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Depreciation and amortization Trading Securities, Change In Unrealized Holding Gain (Loss) Net unrealized loss (gain) on marketable securities Trading Securities, Change in Unrealized Holding Gain (Loss), Total Net unrealized loss (gain) on marketable securities Proceeds From Insurance Settlement, Operating Activities Gain on insurance recovery Share-Based Compensation Stock compensation expense Stock compensation expense Increase (Decrease) In Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) In Trading Securities Investment in marketable securities Increase (Decrease) in Trading Securities, Total Investment in marketable securities Increase (Decrease) In Other Operating Assets Other assets Other assets Other assets Increase (Decrease) In Accounts Payable and Accrued Liabilities Accounts payable and other liabilities Accounts payable and other liabilities Increase (Decrease) In Due To Securities Broker Due to securities broker Net change during the reporting period in the carrying amount of due to securities broker. Increase (Decrease) In Obligations For Securities Sold Obligations for securities sold Net change during the reporting period in the carrying amount of obligations for securities sold. Increase (Decrease) In Income Taxes Payable Deferred taxes Deferred taxes Net Cash Provided By (Used In) Operating Activities Net cash provided by (used in) operating activities Net cash provided by operating activities Net Cash Provided By (Used In) Investing Activities [Abstract] Cash flows from investing activities: Proceeds From Sale Of Real Estate Proceeds from sale of real estate Payments To Acquire Property, Plant, and Equipment Investment in hotel Investment in hotel Investment in hotel Payments To Acquire Real Estate Held-For-Investment Investment in real estate Investment in real estate Other Payments To Acquire Businesses Investment in Portsmouth Proceeds from (investment) in other investments Payments To Acquire Other Investments Investment in Santa Fe Investment in Santa Fe Increase (Decrease) In Restricted Cash Restricted cash Increase (Decrease) in Restricted Cash, Total Change in restricted cash Restricted cash Net Cash Provided By (Used In) Investing Activities Net cash used in investing activities Net cash provided by (used in) investing activities Net Cash Provided By (Used In) Financing Activities [Abstract] Cash flows from financing activities: Borrowings From Mortgage Notes Payable Borrowings from mortgage notes payable The cash inflow during the period towards borrowings from mortgage notes payable. Repayments Of Mortgage Notes Principal payments on mortgage notes payable The cash outflow during the period towards repayment of borrowings supported by a written promise to pay an obligation that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). Principal payments on mortgage notes payable Repayments Of Other Debt Net borrowings (payments on) other notes payable Payments on other notes payable Payments For Purchase Of Other Assets Purchase of treasury stock Purchase of treasury stock Purchase of treasury stock Proceeds From Stock Options Exercised Proceeds from exercise of options Net Cash Provided By (Used In) Financing Activities Net cash (used in) provided by financing activities Net cash used in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase in cash and cash equivalents Net increase in cash and cash equivalents Supplemental Cash Flow Elements [Abstract] Supplemental information: Income Taxes Paid Income tax paid Interest Paid Interest paid Interest paid Accounting Policies [Abstract] Accounting Policies [Abstract] Basis Of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Justice Investors [Abstract] Justice Investors [Abstract] Justice Investors [Text Block] Justice Investors [Text Block] The entire disclosure for the justice investors during the reporting period. Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Real Estate and Accumulated Depreciation Disclosure [Abstract] Real Estate and Accumulated Depreciation Disclosure [Abstract] Real Estate and Accumulated Depreciation Disclosure [Text Block] Real Estate and Accumulated Depreciation Disclosure [Text Block] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Investments In Debt and Marketable Equity Securities (And Certain Trading Assets) Disclosure [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Other Investments [Abstract] Other Investments [Abstract] Other Investments Disclosure [Text Block] Other Investments Disclosure [Text Block] Disclosure relating to investments not specified separately in the taxonomy. Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Other Assets Disclosure [Text Block] Other Assets Disclosure [Text Block] Payables and Accruals [Abstract] Payables And Accruals [Abstract] Other Notes Payable and Line Of Credit [Text Block] Other Notes Payable and Line Of Credit [Text Block] The entire disclosure for the notes payable and line of credit during the reporting period. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Mortgage Notes Payable Disclosure [Text Block] Mortgage Notes Payable Disclosure [Text Block] Hotel Rental Income [Abstract] Hotel Rental Income [Abstract] Hotel Rental Income [Text Block] Hotel Rental Income [Text Block] The entire disclosure for the hotel rental income during the reporting period. Management Agreement [Abstract] Management Agreement [Abstract] Management Agreement [Text Block] Management Agreement [Text Block] The entire disclosure for the management agreement during the reporting period. Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure Of Compensation Related Costs, Share-Based Payments [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Compensation and Retirement Disclosure [Abstract] Compensation and Retirement Disclosure [Abstract]