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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax [Line Items]    
Undistributed non-U.S. subsidiary earnings $ 31,200,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Undistributed earnings subject to U.S. federal income tax 10,900,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries  
Valuation allowance 14,442,000us-gaap_DeferredTaxAssetsValuationAllowance 10,201,000us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax liability not recognized related to tax basis difference in investment in foreign subsidiaries 1,500,000fcn_DeferredTaxLiabilitiesBasisDifferenceInSubsidiaries  
Liability for uncertain tax positions 2,800,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 2,900,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Reversal of liability for uncertain tax positions (1,200,000)fcn_IncreaseDecreaseInLiabilityForUncertainTaxPositions  
Unrecognized tax benefits $ 1,700,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions  
Minimum    
Income Tax [Line Items]    
Operating loss carryforward period 20  
Maximum    
Income Tax [Line Items]    
Operating loss carryforward period Indefinite