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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]      
Gain/Loss on remeasurement of contingent consideration $ 2.7fcn_GainLossOnRemeasurementOfContingentConsideration $ 13.6fcn_GainLossOnRemeasurementOfContingentConsideration $ 5.2fcn_GainLossOnRemeasurementOfContingentConsideration
Accretion expense $ 1.0us-gaap_AccretionExpense $ 2.7us-gaap_AccretionExpense $ 2.2us-gaap_AccretionExpense
6 3/4 % Senior Notes Due 2020      
Assets Sold under Agreements to Repurchase [Line Items]      
Interest percentage 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= fcn_SixAndThreeFourthsPercentSeniorNotesDueTwoThousandTwentyMember		 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= fcn_SixAndThreeFourthsPercentSeniorNotesDueTwoThousandTwentyMember		  
Debt maturity period 2020 2020  
6.0% Senior Notes Due 2022      
Assets Sold under Agreements to Repurchase [Line Items]      
Interest percentage 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= fcn_SeniorNotesSixPointZeroPercentDueTwentyTwentyTwoMember		 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= fcn_SeniorNotesSixPointZeroPercentDueTwentyTwentyTwoMember		  
Debt maturity period 2022 2022