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Goodwill and Intangible Assets - Changes in Intangible Assets, Net of Accumulated Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Finite-Lived Intangible Assets, Net [Abstract]  
Net balance at January 1 $ 31,323us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense (352)us-gaap_AmortizationOfIntangibleAssets
Currency translation (976)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
Net balance at March 31 $ 29,995us-gaap_FiniteLivedIntangibleAssetsNet