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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 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   8,017
Foreign currency translation, Gross Carrying Amount 296 (695)
Ending balance, Goodwill Gross Carrying Amount 339,413 339,117
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   8,017
Foreign currency translation, Net 296 (695)
Ending balance, Goodwill Net $ 199,999 $ 199,703