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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)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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