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Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Cost $ 94,419 $ 92,908
Accumulated Amortization 41,670 32,180
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 15,867 15,867
Accumulated Amortization 8,040 6,360
Customer Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 77,497 77,497
Accumulated Amortization 32,758 26,041
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 1,118 1,118
Accumulated Amortization 643 478
Tradename [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 1,390 1,390
Accumulated Amortization 405 301
Foreign Currency Adjustments [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost (1,453) (2,964)
Accumulated Amortization $ (176) $ (1,000)