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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Taxes
Unrecognized tax benefits	$ 2,700,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits would impact the effective tax rate	1,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Interest accrued	400,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Effective tax rate from operations	25.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations	31.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Provision for (benefit from) income taxes	6,937,000us-gaap_IncomeTaxExpenseBenefit	(2,935,000)us-gaap_IncomeTaxExpenseBenefit
Undistributed foreign earnings			201,700,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
U.S. statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Federal
Income Taxes
Cash and cash equivalents and short-term investments	160,400,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		139,100,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Foreign
Income Taxes
Cash and cash equivalents and short-term investments	$ 231,400,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember		$ 206,400,000us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination	2013
Tax years settled which were under tax examination	2009
Germany | Latest Tax Year
Income Taxes
Tax years settled which were under tax examination	2012
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination	2010
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination	2013
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination	2011
China | Earliest Tax Year
Income Taxes
Tax years subject to examination	2010
United States | Tax Year 2011
Income Taxes
Tax years currently under tax examination	2011
United States | Tax Year 2012
Income Taxes
Tax years currently under tax examination	2012

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Income Tax Years No Longer Subject to Income Tax Examinations

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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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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Tax year being audited in the income tax examination, in CCYY format.

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