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Share Based Compensation - Share Based Compensation Expense Included in Operating Expense (Income) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 3,417us-gaap_ShareBasedCompensation $ 16,809us-gaap_ShareBasedCompensation $ 14,929us-gaap_ShareBasedCompensation
General and Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation 1,001us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 7,779us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 7,144us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Other Operating Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation $ 2,416us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= for_OtherOperatingExpensesMember		 $ 9,030us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= for_OtherOperatingExpensesMember		 $ 7,785us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= for_OtherOperatingExpensesMember