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Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of Provision of Income Taxes [Line Items]                      
Income tax expense at federal statutory rate                 $ 35,494us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 11,134us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 1,090us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit                 3,494us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,270us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,607us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Benefit from lower foreign tax rates                 (4,154)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (5,214)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (5,357)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Non-deductible goodwill impairment                   29,313us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 38,635us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Valuation allowance on foreign tax credits & net operating loss carryforward                 4,604us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 8,206us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance  
Other expenses not deductible for tax purposes                 2,962us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 2,872us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther 3,682us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Changes in non-taxable contingent consideration                   (2,777)fcn_IncomeTaxReconciliationChangesInContingentConsideration (1,151)fcn_IncomeTaxReconciliationChangesInContingentConsideration
Other adjustments, net                 204us-gaap_IncomeTaxReconciliationOtherAdjustments (4,399)us-gaap_IncomeTaxReconciliationOtherAdjustments (406)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision $ 9,702us-gaap_IncomeTaxExpenseBenefit $ 12,329us-gaap_IncomeTaxExpenseBenefit $ 10,225us-gaap_IncomeTaxExpenseBenefit $ 10,348us-gaap_IncomeTaxExpenseBenefit $ 5,859us-gaap_IncomeTaxExpenseBenefit $ 3,360us-gaap_IncomeTaxExpenseBenefit $ 23,315us-gaap_IncomeTaxExpenseBenefit $ 9,871us-gaap_IncomeTaxExpenseBenefit $ 42,604us-gaap_IncomeTaxExpenseBenefit $ 42,405us-gaap_IncomeTaxExpenseBenefit $ 40,100us-gaap_IncomeTaxExpenseBenefit