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Real Estate - Additional Information (Detail) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |  |
Costs relate to water, sewer and other infrastructure assets | $ 1,520,000 for_CostsRelateToWaterSewerAndOtherInfrastructureAssets |  |
Reimbursements from utility and improvement districts | (4,130,000)us-gaap_RecoveryOfDirectCosts | (1,536,000)us-gaap_RecoveryOfDirectCosts |
Real Estate Investment Property, Net | 164,219,000 us-gaap_RealEstateInvestmentPropertyNet |  | 161,301,000 us-gaap_RealEstateInvestmentPropertyNet
Utility and Improvement District [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Cost of asset in developed and under development projects | 90,506,000 for_CostOfAssetInEntitledDevelopedAndUnderDevelopmentProjects / us-gaap_RealEstatePropertiesAxis = for_UtilityAndImprovementDistrictMember |  | 65,212,000 for_CostOfAssetInEntitledDevelopedAndUnderDevelopmentProjects / us-gaap_RealEstatePropertiesAxis = for_UtilityAndImprovementDistrictMember
Cibolo Canyons Project [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Return of reimbursements received in relation to direct costs and expenses previously paid or incurred for development of real estate projects | 33,552,000 for_Returnofreimbursementsreceivedinrelationtodirectcostsandexpensespreviouslypaidorincurredfordevelopmentofrealestateprojects / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember |  | 33,552,000 for_Returnofreimbursementsreceivedinrelationtodirectcostsandexpensespreviouslypaidorincurredfordevelopmentofrealestateprojects / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember
Costs relate to water, sewer and other infrastructure assets | 15,189,000 for_CostsRelateToWaterSewerAndOtherInfrastructureAssets / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember |  |
Consolidated Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Reimbursements from utility and improvement districts | 4,130,000 us-gaap_RecoveryOfDirectCosts / us-gaap_RealEstatePropertiesAxis = us-gaap_ConsolidatedPropertiesMember |  |
Multi Family Development Properties [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Real Estate Investment Property, Net | 78,566,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_RealEstatePropertiesAxis = for_MultiFamilyDevelopmentPropertiesMember |  |
San Antonio Texas [Member] | Cibolo Canyons Project [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Cost of asset in developed and under development projects | 47,075,000 for_CostOfAssetInEntitledDevelopedAndUnderDevelopmentProjects / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember / us-gaap_StatementGeographicalAxis = for_SanAntonioTexasMember |  | 31,913,000 for_CostOfAssetInEntitledDevelopedAndUnderDevelopmentProjects / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember / us-gaap_StatementGeographicalAxis = for_SanAntonioTexasMember
Cumulative Reimbursable Cost Associated with Real Estate Projects in Development | 65,438,000 for_CumulativeReimbursableCostAssociatedwithRealEstateProjectsinDevelopment / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember / us-gaap_StatementGeographicalAxis = for_SanAntonioTexasMember |  | 65,465,000 for_CumulativeReimbursableCostAssociatedwithRealEstateProjectsinDevelopment / us-gaap_RealEstatePropertiesAxis = for_CiboloCanyonsProjectMember / us-gaap_StatementGeographicalAxis = for_SanAntonioTexasMember
Austin, Texas [Member] | Multi Family Property [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Real Estate Investment Property, Net | 52,742,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_RealEstatePropertiesAxis = for_MultiFamilyPropertyMember / us-gaap_StatementGeographicalAxis = for_AustinTexasMember |  |
Number Of Units Of Multifamily Project | 257 for_NumberOfUnitsOfMultifamilyProject / us-gaap_RealEstatePropertiesAxis = for_MultiFamilyPropertyMember / us-gaap_StatementGeographicalAxis = for_AustinTexasMember |  |
Austin, Texas [Member] | Hotel Property [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Real Estate Investment Property, Net | 32,505,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_RealEstatePropertiesAxis = for_HotelPropertyMember / us-gaap_StatementGeographicalAxis = for_AustinTexasMember |  |
Commercial and income producing properties, investment unit | 413 for_CommercialAndIncomeProducingPropertiesUnit / us-gaap_RealEstatePropertiesAxis = for_HotelPropertyMember / us-gaap_StatementGeographicalAxis = for_AustinTexasMember |  |
Fort Worth [Member] | 713910 Golf Courses and Country Clubs [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Real Estate Investment Property, Net | $ 406,000 us-gaap_RealEstateInvestmentPropertyNet / us-gaap_RealEstatePropertiesAxis = naics_ZZ713910 / us-gaap_StatementGeographicalAxis = for_FortWorthMember |  |

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