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Debt - Debt (Detail)
 0 Months Ended 12 Months Ended
Feb. 26, 2013
Dec. 31, 2014
Dec. 31, 2013
Convertible Debt [Member]      
Line of Credit Facility [Line Items]      
Average interest rate   3.75%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 3.75%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Debt Instrument, Maturity Date Mar. 01, 2020    
6% Tangible Equity Units [Member]      
Line of Credit Facility [Line Items]      
Average interest rate   6.00%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= for_SixPercentTangibleEquityUnitsMember		 6.00%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= for_SixPercentTangibleEquityUnitsMember
Secured Promissory Notes [Member]      
Line of Credit Facility [Line Items]      
Average interest rate   3.17%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 3.17%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Other Indebtedness [Member]      
Line of Credit Facility [Line Items]      
Variable and fixed interest rates ranging, minimum   2.19%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_OtherDebtSecuritiesMember		  
Variable and fixed interest rates ranging, maximum   5.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_OtherDebtSecuritiesMember		  
Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Maturity Date Jun. 01, 2022    
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Expiration Date   May 15, 2017  
Senior Secured Credit Facility [Member] | Term Loan Facility [Member]      
Line of Credit Facility [Line Items]      
Average interest rate   4.17%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= for_SeniorSecuredCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= for_TermLoanFacilityMember		 4.17%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= for_SeniorSecuredCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= for_TermLoanFacilityMember
Senior Secured Credit Facility [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Average interest rate   8.50%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= for_SeniorSecuredCreditFacilityMember		 8.50%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= for_SeniorSecuredCreditFacilityMember
Second Amended Senior Secured Credit Facility [Member] [Member] | Term Loan Facility [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Expiration Date   Sep. 14, 2017  
Second Amended Senior Secured Credit Facility [Member] [Member] | Revolving Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Maturity Date   Sep. 14, 2015  
6% Tangible Equity Units [Member] | Senior Notes [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Expiration Date   Dec. 15, 2016