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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 339,117 $ 331,795
Acquired goodwill, Gross Carrying Amount 396,216 8,017
Foreign currency translation, Gross Carrying Amount (1,284) (695)
Ending balance, Goodwill Gross Carrying Amount 734,049 339,117
Beginning balance, Accumulated Impairment (Loss) (139,414) (139,414)
Acquired goodwill, Accumulated Impairment (Loss) 0 0
Foreign currency translation, Accumulated Impairment (Loss) 0 0
Ending balance, Accumulated Impairment (Loss) (139,414) (139,414)
Beginning balance, Goodwill Net 199,703 192,381
Acquired goodwill, Net 396,216 8,017
Foreign currency translation, Net (1,284) (695)
Ending balance, Goodwill Net $ 594,635 $ 199,703