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Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]        
Intangible assets - finite life, Beginning of period     $ 58,398 $ 46,611
Amortization expense $ (2,600) $ (1,800) (5,230) (3,593)
Foreign currency adjustments     (748) (85)
Intangible assets - finite life, End of period $ 52,420 $ 42,933 $ 52,420 $ 42,933