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Goodwill and Intangible Assets - Schedule of Changes in Intangible Assets, Net of Accumulated Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward]    
Net balance at January 1 $ 35,029us-gaap_FiniteLivedIntangibleAssetsNet $ 38,648us-gaap_FiniteLivedIntangibleAssetsNet
Additions 500us-gaap_FinitelivedIntangibleAssetsAcquired1 0us-gaap_FinitelivedIntangibleAssetsAcquired1
Amortization expense (2,979)us-gaap_AmortizationOfIntangibleAssets (3,708)us-gaap_AmortizationOfIntangibleAssets
Currency translation (1,227)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments 89us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
Net balance at December 31 $ 31,323us-gaap_FiniteLivedIntangibleAssetsNet $ 35,029us-gaap_FiniteLivedIntangibleAssetsNet