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Activity Related to Liability for Special Charges (Parenthetical) (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2016 USD ($)
Other Income And Expenses [Abstract] |
Net non-cash expense reversals | $ 0.2

X
- Definition Special charges reserve net non-cash expense reversals. + References No definition available. + Details
Name: | fcn_SpecialChargesReserveNetNonCashExpenseReversals
Namespace Prefix: | fcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration