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Notes Receivable from Employees - Additional information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 Note | Dec. 31, 2013 Note | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Notes outstanding | 311 fcn_NumberOfNotesReceivablesOutstanding | 340 fcn_NumberOfNotesReceivablesOutstanding |
Amortization of forgivable loan expense | $ 32.1 fcn_AmortizationOfLoansToEmployees | $ 35.1 fcn_AmortizationOfLoansToEmployees | $ 32.8 fcn_AmortizationOfLoansToEmployees

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- Definition Amortization Of Loans To Employees + References No definition available. + Details
Name: | fcn_AmortizationOfLoansToEmployees
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of Notes Receivables Outstanding + References No definition available. + Details
Name: | fcn_NumberOfNotesReceivablesOutstanding
Namespace Prefix: | fcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration