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Goodwill and Intangible Assets - Summary of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Cost $ 84,180 $ 94,658
Accumulated Amortization 48,221 44,702
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 14,457 15,867
Accumulated Amortization 9,414 8,609
Customer Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 68,943 77,497
Accumulated Amortization 37,873 35,024
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 910 1,118
Accumulated Amortization 762 698
Tradename [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 1,390 1,390
Accumulated Amortization 579 440
Foreign Currency Adjustments [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost (1,520) (1,214)
Accumulated Amortization $ (407) $ (69)