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Investment in Unconsolidated Ventures - Summarized Income Statement Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |
Revenues | $ 16,372 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | $ 8,895 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Earnings (loss) | 5,310 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems | 3,669 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Equity in earnings of unconsolidated ventures | 3,045 us-gaap_IncomeLossFromEquityMethodInvestments | 991 us-gaap_IncomeLossFromEquityMethodInvestments
242, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 5,331 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 1,475 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
Earnings (loss) | 3,464 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 533 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
Equity in earnings of unconsolidated ventures | 1,766 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember | 277 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TwoHundredFortyTwoLlcMember
CL Ashton Woods [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 1,350 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 708 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
Earnings (loss) | 527 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 220 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
Equity in earnings of unconsolidated ventures | 678 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember | 318 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClAshtonWoodsMember
CL Realty [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 279 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 368 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
Earnings (loss) | 160 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 230 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
Equity in earnings of unconsolidated ventures | 80 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember | 115 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_ClRealtyMember
CREA FMF [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 6 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Earnings (loss) | (113)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | (25)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Equity in earnings of unconsolidated ventures | (113)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember | (25)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_CREAFMFMember
Elan 99, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
Earnings (loss) | (2)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
Equity in earnings of unconsolidated ventures | (2)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_Elan99LLCMember
FMF Peakview [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 186 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
Earnings (loss) | (482)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | (73)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
Equity in earnings of unconsolidated ventures | (96)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember | (15)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_FmfPeakviewLlcMember
HM Stonewall Estates [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 1,058 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 1,001 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
Earnings (loss) | 515 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 352 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
Equity in earnings of unconsolidated ventures | 230 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember | 141 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_HmStonewallEstatesMember
LM Land Holdings [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 1,976 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 4,898 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
Earnings (loss) | 1,250 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 2,927 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
Equity in earnings of unconsolidated ventures | 364 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember | 677 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_LmLandHoldingsMember
PSW Communities [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 2,427 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | 0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Earnings (loss) | 195 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | (216)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Equity in earnings of unconsolidated ventures | 173 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember | (189)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_PSWCommunitiesMember
Temco [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 58 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | 60 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Earnings (loss) | (1)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | (18)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Equity in earnings of unconsolidated ventures | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember | (9)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_TemcoMember
Other ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Revenues | 3,701 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | 385 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember
Earnings (loss) | (203)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | (261)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember
Equity in earnings of unconsolidated ventures | $ (35)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember | $ (299)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = for_OtherVenturesMember

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- Definition The amount of income (loss) from continuing operations before extraordinary items reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 + Details
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