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Taxation - Income Tax Rate Reconciliation (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Rate Reconciliation [Abstract]      
Provision at the U.S. federal statutory rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit (3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign tax rate differential 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Valuation allowance 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 10.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Research credits (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (4.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (10.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Stock-based compensation 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Goodwill impairment 5.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Other (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 6.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax expense effective rate (31.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 45.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations