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Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 387,311 $ 392,610
Foreign currency translation adjustment (9,001) (5,299)
Goodwill, Ending Balance $ 378,310 $ 387,311