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Schedule of Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Line Items]
U.S. statutory federal tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign taxes	(58.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(11.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(10.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Goodwill impairment	36.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
U.S. research and development credit	(7.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	(7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Uncertain tax positions	7.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	4.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	(1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Other permanent items	3.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	(2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Valuation allowance		0.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
State income taxes, net of federal tax benefit	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	(1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other, net	(1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate, Total	14.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations	18.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations	18.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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