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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill, beginning balance $ 167,547 $ 134,062
Goodwill, acquisitions and related adjustments 2,488 34,638
Goodwill, foreign currency translation (711) (1,153)
Goodwill, ending balance 169,324 167,547
Tradename, beginning balance 19,766 18,419
Tradename, acquisitions and related adjustments   1,730
Tradename, foreign currency translation (238) (383)
Tradename, ending balance $ 19,528 $ 19,766