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)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 2
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- Definition

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+ References

No definition available.

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