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Goodwill and Intangible Assets - Intangible Assets - Finite Life (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 84,593 | $ 94,658
Accumulated Amortization | 46,045 | 44,702
Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 14,457 | 15,867
Accumulated Amortization | 8,975 | 8,609
Customer Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 68,943 | 77,497
Accumulated Amortization | 36,106 | 35,024
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 910 | 1,118
Accumulated Amortization | 717 | 698
Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 1,390 | 1,390
Accumulated Amortization | 544 | 440
Foreign Currency Adjustments [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | (1,107) | (1,214)
Accumulated Amortization | $ (297) | $ (69)

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