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Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Cost $ 87,643 $ 84,180
Accumulated Amortization 54,391 48,221
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 14,457 14,457
Accumulated Amortization 10,352 9,414
Customer Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 68,943 68,943
Accumulated Amortization 42,795 37,873
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 910 910
Accumulated Amortization 875 762
Tradename [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 5,294 1,390
Accumulated Amortization 996 579
Foreign Currency Adjustments [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost (1,961) (1,520)
Accumulated Amortization $ (627) $ (407)