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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 331,795 $ 290,323
Acquired goodwill, Gross Carrying Amount 8,017 41,993
Foreign currency translation, Gross Carrying Amount (186) (521)
Ending balance, Goodwill Gross Carrying Amount 339,626 331,795
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 192,381 150,909
Acquired goodwill, Net 8,017 41,993
Foreign currency translation, Net (186) (521)
Ending balance, Goodwill Net $ 200,212 $ 192,381