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Schedule of Share-based Compensation Expense (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |
Special charges | $ 1,628,000 fcn_SpecialChargesAmount | $ 5,347,000 fcn_SpecialChargesAmount | $ 9,364,000 fcn_SpecialChargesAmount | $ 27,568,000 fcn_SpecialChargesAmount | $ 10,419,000 fcn_SpecialChargesAmount | $ 427,000 fcn_SpecialChargesAmount | $ 16,339,000 fcn_SpecialChargesAmount | $ 38,414,000 fcn_SpecialChargesAmount | $ 29,557,000 fcn_SpecialChargesAmount
Equity award expense acceleration |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 200,000 fcn_SpecialChargesAmount / fcn_SpecialChargesAmountAxis = fcn_EquityAwardsMember |  |
Share based awards, value of shares forfeited |  |  |  |  |  |  | 1,200,000 fcn_SharebasedCompensationArrangementBySharebasedPaymentAwardValueOfAwardsForfeited / fcn_SpecialChargesAmountAxis = fcn_EquityAwardsMember |  |
Option expense acceleration |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |  |  |  |  |
Special charges |  |  |  |  |  |  | 100,000 fcn_SpecialChargesAmount / fcn_SpecialChargesAmountAxis = fcn_StockOptionActivityMember |  |
Options, value of shares forfeited |  |  |  |  |  |  | $ 200,000 fcn_ShareBasedCompensationArrangementByOptionsValueOfSharesForfeited / fcn_SpecialChargesAmountAxis = fcn_StockOptionActivityMember |  |

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- Definition Share Based Compensation Arrangement by Options Value Of Shares Forfeited + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Value of Awards Forfeited + References No definition available. + Details
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- Definition The charge against earnings in the period, comprised of costs associated with non-recurring activities related to our global branding strategy and other strategic branding decisions, a realignment of our workforce and consolidation of office locations. + References No definition available. + Details
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- Details
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- Details
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