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Segment Information - Selected Segment Financial Data, Revenues and Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues	$ 265,822	$ 254,808	$ 498,639	$ 476,281
Income before income taxes	32,876	13,646	32,184	3,904
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income before income taxes	(30,502)	(47,525)	(78,261)	(97,551)
Americas - United States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	160,754	154,957	306,538	291,087
Americas - Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	16,977	22,788	34,943	41,427
EMEA [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	68,504	57,350	117,888	104,811
Income before income taxes	33,494	24,669	54,195	42,340
Asia/Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	19,587	19,713	39,270	38,956
Income before income taxes	8,315	10,428	18,572	16,082
Americas [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Income before income taxes	$ 21,569	$ 26,074	$ 37,678	$ 43,033

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 940



-SubTopic 20



-Section 25



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953



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-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



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-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 10



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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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