The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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- 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

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-SubTopic 20

-Section 25

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 5

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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)

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 290,224us-gaap_SalesRevenueNet	$ 249,644us-gaap_SalesRevenueNet	$ 254,808us-gaap_SalesRevenueNet	$ 221,473us-gaap_SalesRevenueNet	$ 283,162us-gaap_SalesRevenueNet	$ 213,939us-gaap_SalesRevenueNet	$ 205,830us-gaap_SalesRevenueNet	$ 161,997us-gaap_SalesRevenueNet	$ 1,016,149us-gaap_SalesRevenueNet	$ 864,928us-gaap_SalesRevenueNet	$ 666,579us-gaap_SalesRevenueNet
Depreciation and amortization expense									86,683	69,967	50,781
Stock-based compensation expense									11,045us-gaap_ShareBasedCompensation	13,572us-gaap_ShareBasedCompensation	15,186us-gaap_ShareBasedCompensation
Income (loss) before taxes	69,700	25,165	13,646	(9,742)	74,499	19,109	4,161	(4,610)	98,769	93,159	65,268
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Depreciation and amortization expense									60,200	44,053	31,614
Stock-based compensation expense									7,467	10,128	14,177
Income (loss) before taxes									(199,583)	(173,782)	(149,418)
Americas - United States \| Operating Segments
Segment Reporting Information [Line Items]
Revenues									614,488	450,251	277,775
Americas - Other \| Operating Segments
Segment Reporting Information [Line Items]
Revenues									87,279	91,639	74,422
EMEA \| Operating Segments
Segment Reporting Information [Line Items]
Revenues									230,879	228,679	218,015
Depreciation and amortization expense									4,126	6,310	5,175
Stock-based compensation expense									419	759	439
Income (loss) before taxes									116,120	87,522	78,848
Asia/Pacific \| Operating Segments
Segment Reporting Information [Line Items]
Revenues									83,503	94,359	96,367
Depreciation and amortization expense									1,809	2,574	3,075
Stock-based compensation expense									249	293	314
Income (loss) before taxes									38,853	33,923	32,673
Americas \| Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization expense									20,548	17,030	10,917
Stock-based compensation expense									2,910	2,392	256
Income (loss) before taxes									$ 143,379	$ 145,496	$ 103,165