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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]        
Goodwill impairment $ 83,752,000us-gaap_GoodwillImpairmentLoss   $ 83,752,000us-gaap_GoodwillImpairmentLoss $ 110,387,000us-gaap_GoodwillImpairmentLoss
Finite lived intangible assets, amortization expense   15,521,000fcn_AmortizationAndImpairmentOfOtherIntangibleAssets 22,954,000fcn_AmortizationAndImpairmentOfOtherIntangibleAssets 22,586,000fcn_AmortizationAndImpairmentOfOtherIntangibleAssets
Estimated amortization expense for the year 2015   11,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Estimated amortization expense for the year 2016   10,700,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Estimated amortization expense for the year 2017   9,900,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Estimated amortization expense for the year 2018   8,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Estimated amortization expense for the year 2019   7,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Estimated amortization expense after the year 2019   23,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Strategic Communications        
Finite-Lived Intangible Assets [Line Items]        
Goodwill impairment     $ 83,752,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fcn_StrategicCommunicationsMember		 $ 110,400,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= fcn_StrategicCommunicationsMember