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Share Based Compensation - Share Based Compensation Expense (Income) Included in Operating Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share based and Long Term Incentive Compensation $ 3,458for_ShareBasedandLongTermIncentiveCompensation $ 313for_ShareBasedandLongTermIncentiveCompensation
General and administrative expense [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share based and Long Term Incentive Compensation 2,122for_ShareBasedandLongTermIncentiveCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
(23)for_ShareBasedandLongTermIncentiveCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
Other Operating Expenses [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Share based and Long Term Incentive Compensation $ 1,336for_ShareBasedandLongTermIncentiveCompensation
/ us-gaap_IncomeStatementLocationAxis
= for_OtherOperatingExpensesMember
$ 336for_ShareBasedandLongTermIncentiveCompensation
/ us-gaap_IncomeStatementLocationAxis
= for_OtherOperatingExpensesMember