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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities:    
Net income (loss) $ 2,490,000us-gaap_ProfitLoss $ (8,040,000)us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 3,716,000us-gaap_DepreciationDepletionAndAmortization 3,498,000us-gaap_DepreciationDepletionAndAmortization
Loss on extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 3,910,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Loss on disposal of assets 51,000us-gaap_GainLossOnDispositionOfAssets1 1,092,000us-gaap_GainLossOnDispositionOfAssets1
Gain on sale of real estate (11,100,000)us-gaap_GainsLossesOnSalesOfOtherRealEstate 0us-gaap_GainsLossesOnSalesOfOtherRealEstate
Gain on insurance recovery 0intg_GainOnInsuranceRecovery (249,000)intg_GainOnInsuranceRecovery
Net unrealized loss (gain) on marketable securities 3,980,000us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (1,110,000)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Impairment loss on other investments 400,000intg_ImpairmentLossOnOtherInvestments 0intg_ImpairmentLossOnOtherInvestments
Unrealized loss (gain) on other investments 98,000intg_UnrealizedGainLossOnOtherInvestmentsAndDerivativeInstruments (130,000)intg_UnrealizedGainLossOnOtherInvestmentsAndDerivativeInstruments
Stock compensation expense 688,000us-gaap_ShareBasedCompensation 326,000us-gaap_ShareBasedCompensation
Changes in assets and liabilities:    
Investment in marketable securities (1,403,000)us-gaap_IncreaseDecreaseInTradingSecurities 3,111,000us-gaap_IncreaseDecreaseInTradingSecurities
Other assets 31,000us-gaap_IncreaseDecreaseInOtherOperatingAssets (2,472,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and other liabilities (2,549,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 5,864,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Due to securities broker 1,207,000intg_IncreaseDecreaseInDueToSecuritiesBroker (347,000)intg_IncreaseDecreaseInDueToSecuritiesBroker
Obligations for securities sold (175,000)intg_IncreaseDecreaseInObligationsForSecuritiesSold (2,565,000)intg_IncreaseDecreaseInObligationsForSecuritiesSold
Deferred taxes 2,672,000us-gaap_DeferredIncomeTaxExpenseBenefit (2,194,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Net cash provided by operating activities 106,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 694,000us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Net proceeds from sale of real estate 17,592,000us-gaap_ProceedsFromSaleOfOtherRealEstateHeldforinvestment 0us-gaap_ProceedsFromSaleOfOtherRealEstateHeldforinvestment
Investment in hotel (4,081,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,255,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Investment in real estate (485,000)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment (235,000)us-gaap_PaymentsToAcquireRealEstateHeldForInvestment
Payments for other investments (150,000)intg_PaymentForOtherInvestment (300,000)intg_PaymentForOtherInvestment
Investment in Santa Fe (92,000)intg_PaymentsToAcquireInterestInSubsidiaries (30,000)intg_PaymentsToAcquireInterestInSubsidiaries
Investment in Portsmouth (32,000)intg_PaymentsToAcquireInterestInAffiliates (2,000)intg_PaymentsToAcquireInterestInAffiliates
Net cash provided by (used in) investing activities 12,752,000us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (2,822,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Restricted cash - withdrawal of (payments to) mortgage impounds 259,000us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities (1,140,000)us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
Redemption payments, net 0intg_RedemptionPayments (64,152,000)intg_RedemptionPayments
Net (payments on) borrowings from mortgage notes payable (7,651,000)us-gaap_ProceedsFromOtherDebt 67,517,000us-gaap_ProceedsFromOtherDebt
Purchase of treasury stock (60,000)us-gaap_PaymentsForRepurchaseOfCommonStock (5,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash (used in) provided by financing activities (7,452,000)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 2,220,000us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 5,406,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 92,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at the beginning of the period 4,705,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,453,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at the end of the period 10,111,000us-gaap_CashAndCashEquivalentsAtCarryingValue 1,545,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental information:    
Interest paid $ 8,160,000us-gaap_InterestPaid $ 6,271,000us-gaap_InterestPaid