Goodwill and Intangible Assets - Changes in Goodwill (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2016	Dec. 31, 2015
Goodwill [Line Items]
Beginning Balance, Goodwill Net	$ 195,733	$ 193,831
Acquisition	70,223	10,054
Effect of Foreign Currency	2,193	(8,152)
Ending Balance, Goodwill Net	268,149	195,733
Americas [Member]
Goodwill [Line Items]
Beginning Balance, Goodwill Net	186,049	193,831
Acquisition	70,223
Effect of Foreign Currency	1,848	(7,782)
Ending Balance, Goodwill Net	258,120	186,049
EMEA [Member]
Goodwill [Line Items]
Beginning Balance, Goodwill Net	9,684
Acquisition		10,054
Effect of Foreign Currency	345	(370)
Ending Balance, Goodwill Net	$ 10,029	$ 9,684

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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