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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 392,610us-gaap_Goodwill $ 397,262us-gaap_Goodwill
Foreign currency translation adjustment (5,299)us-gaap_GoodwillTranslationAdjustments (4,652)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance $ 387,311us-gaap_Goodwill $ 392,610us-gaap_Goodwill