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Components of Debt Obligations (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
6 3/4 % Senior Notes Due 2020    
Debt Instrument [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    
Debt Instrument [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