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Long-Term Debt and Capital Lease Obligations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2013
Debt Instrument [Line Items]        
Senior secured revolving line of credit $ 425.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity      
Credit facility, Term (Years) 5fcn_DebtInstrumentTerms      
Guarantee obligation by domestic subsidiaries for borrowings under bank credit facility   700.0us-gaap_GuaranteeObligationsCurrentCarryingValue    
FS Asia Advisory Limited        
Debt Instrument [Line Items]        
Notes issued in connection with acquisition     35.0us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= fcn_FsAsiaAdvisoryLimitedMember
 
Repayments of Notes payable   24.0us-gaap_RepaymentsOfNotesPayable
/ us-gaap_BusinessAcquisitionAxis
= fcn_FsAsiaAdvisoryLimitedMember
   
New Revolving Senior Bank Credit Facility        
Debt Instrument [Line Items]        
Senior secured revolving line of credit 350.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= fcn_NewRevolvingSeniorBankCreditFacilityMember
     
Line of credit, maturity date Nov. 25, 2017      
Former Credit Facility        
Debt Instrument [Line Items]        
Senior secured revolving line of credit 250.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= fcn_FormerCreditFacilityMember
     
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
Senior notes, redemption date   Nov. 15, 2017    
Debt issue costs   7.6us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= fcn_SeniorNotesSixPointZeroPercentDueTwentyTwentyTwoMember
   
6.0% Senior Notes Due 2022 | Minimum        
Debt Instrument [Line Items]        
Number of days prior notice required for redemption of notes   30fcn_NumberOfDaysPriorNoticeRequiredForRedemptionOfNotes
/ us-gaap_LongtermDebtTypeAxis
= fcn_SeniorNotesSixPointZeroPercentDueTwentyTwentyTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
6.0% Senior Notes Due 2022 | Maximum        
Debt Instrument [Line Items]        
Number of days prior notice required for redemption of notes   60fcn_NumberOfDaysPriorNoticeRequiredForRedemptionOfNotes
/ us-gaap_LongtermDebtTypeAxis
= fcn_SeniorNotesSixPointZeroPercentDueTwentyTwentyTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
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
Debt issue costs   9.8us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= fcn_SixAndThreeFourthsPercentSeniorNotesDueTwoThousandTwentyMember
   
Notes maturity date   Apr. 01, 2011    
6 3/4 % Senior Notes Due 2020 | Minimum        
Debt Instrument [Line Items]        
Number of days prior notice required for redemption of notes   30fcn_NumberOfDaysPriorNoticeRequiredForRedemptionOfNotes
/ us-gaap_LongtermDebtTypeAxis
= fcn_SixAndThreeFourthsPercentSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
6 3/4 % Senior Notes Due 2020 | Maximum        
Debt Instrument [Line Items]        
Number of days prior notice required for redemption of notes   60fcn_NumberOfDaysPriorNoticeRequiredForRedemptionOfNotes
/ us-gaap_LongtermDebtTypeAxis
= fcn_SixAndThreeFourthsPercentSeniorNotesDueTwoThousandTwentyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Letter of Credit        
Debt Instrument [Line Items]        
Line of credit, borrowing limit used   $ 1.4us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
  1.4us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
Unsecured Notes | FS Asia Advisory Limited        
Debt Instrument [Line Items]        
Interest percentage   8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= fcn_FsAsiaAdvisoryLimitedMember
/ us-gaap_LongtermDebtTypeAxis
= fcn_UnsecuredNotesMember