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Schedule of Share-based Compensation Expense (Parenthetical) (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                  
Special charges $ 1,628,000fcn_SpecialChargesAmount $ 5,347,000fcn_SpecialChargesAmount $ 9,364,000fcn_SpecialChargesAmount $ 27,568,000fcn_SpecialChargesAmount $ 10,419,000fcn_SpecialChargesAmount $ 427,000fcn_SpecialChargesAmount $ 16,339,000fcn_SpecialChargesAmount $ 38,414,000fcn_SpecialChargesAmount $ 29,557,000fcn_SpecialChargesAmount
Equity award expense acceleration                  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                  
Special charges             200,000fcn_SpecialChargesAmount
/ fcn_SpecialChargesAmountAxis
= fcn_EquityAwardsMember		    
Share based awards, value of shares forfeited             1,200,000fcn_SharebasedCompensationArrangementBySharebasedPaymentAwardValueOfAwardsForfeited
/ fcn_SpecialChargesAmountAxis
= fcn_EquityAwardsMember		    
Option expense acceleration                  
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]                  
Special charges             100,000fcn_SpecialChargesAmount
/ fcn_SpecialChargesAmountAxis
= fcn_StockOptionActivityMember		    
Options, value of shares forfeited             $ 200,000fcn_ShareBasedCompensationArrangementByOptionsValueOfSharesForfeited
/ fcn_SpecialChargesAmountAxis
= fcn_StockOptionActivityMember