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Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | $ 266,354 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets | $ 240,490 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Venture Borrowings | 123,508 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing | 102,247 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing
Venture Equity | 111,797 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity | 110,447 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Investment in venture | 65,381 us-gaap_EquityMethodInvestments | 65,005 us-gaap_EquityMethodInvestments
242, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 35,556 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 33,021 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
Venture Borrowings | 9,328 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 6,940 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
Venture Equity | 22,253 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 21,789 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
Investment in venture | 10,363 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 10,098 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
CL Ashton Woods [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 12,649 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 13,269 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
Venture Borrowings | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
Venture Equity | 9,479 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 11,453 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
Investment in venture | 4,693 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 6,015 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
CL Realty [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 7,965 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 7,960 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
Venture Borrowings | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
Venture Equity | 7,899 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 7,738 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
Investment in venture | 3,950 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 3,869 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
CREA FMF [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 50,251 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | 40,014 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Venture Borrowings | 40,648 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | 29,660 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Venture Equity | 5,874 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | 5,987 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Investment in venture | 5,403 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | 5,516 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Elan 99, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 12,060 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 10,070 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
Venture Borrowings | 1 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 1 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
Venture Equity | 10,333 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 9,643 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
Investment in venture | 9,299 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 8,679 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
FMF Littleton [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 32,765 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember | 26,953 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember
Venture Borrowings | 3,912 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember
Venture Equity | 24,737 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember | 24,435 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember
Investment in venture | 6,362 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember | 6,287 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FMFLittletonMember
FMF Peakview [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 45,457 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | 43,638 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
Venture Borrowings | 24,774 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | 23,070 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
Venture Equity | 17,462 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | 17,464 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
Investment in venture | 3,574 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | 3,575 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
HM Stonewall Estates [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 3,629 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 3,750 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
Venture Borrowings | 33 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 669 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
Venture Equity | 3,596 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 3,081 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
Investment in venture | 1,982 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 1,752 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
LM Land Holdings [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 30,487 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 25,561 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
Venture Borrowings | 8,505 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 4,448 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
Venture Equity | 19,750 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 18,500 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
Investment in venture | 9,686 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 9,322 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
PSW Communities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 18,964 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | 16,045 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Venture Borrowings | 12,870 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | 10,515 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Venture Equity | 4,610 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | 4,415 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Investment in venture | 4,097 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | 3,924 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Temco [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 11,734 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | 11,756 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Venture Borrowings | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | 0 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Venture Equity | 11,556 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | 11,556 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Investment in venture | 5,778 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | 5,778 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Other ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Venture Assets | 4,837 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | 8,453 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember
Venture Borrowings | 23,437 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | 26,944 for_EquityMethodInvestmentSummarizedFinancialInformationBorrowing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember
Venture Equity | (25,752)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | (25,614)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember
Investment in venture | $ 194 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | $ 190 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember

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