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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 224,095 | $ 155,062 | $ 149,797 | $ 137,625 | $ 135,037 | $ 112,149 | $ 113,366 | $ 104,543 | $ 666,579 | $ 465,095 | $ 418,424
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 50,781 | 28,377 | 26,347
Stock-based compensation expense |  |  |  |  |  |  |  |  | 15,186 | 11,254 | 7,790
Income (loss) before income taxes | 74,011 | 4,480 | (10,846) | (2,377) | 35,997 | 11,021 | 10,504 | 6,791 | 65,268 | 64,313 | 48,702
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 352,197 | 245,703 | 221,560
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 10,917 | 11,139 | 9,903
Stock-based compensation expense |  |  |  |  |  |  |  |  | 256 | 1,496 | 1,684
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 103,165 | 84,392 | 73,670
EMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 218,015 | 164,874 | 150,525
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 5,175 | 4,473 | 3,731
Stock-based compensation expense |  |  |  |  |  |  |  |  | 439 | 403 | 145
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 78,848 | 45,755 | 42,026
Asia /Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 96,367 | 54,518 | 46,339
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 3,075 | 3,410 | 3,126
Stock-based compensation expense |  |  |  |  |  |  |  |  | 314 | 418 | 425
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 32,673 | 6,962 | (1,481)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 31,614 | 9,355 | 9,587
Stock-based compensation expense |  |  |  |  |  |  |  |  | 14,177 | 8,937 | 5,536
Income (loss) before income taxes |  |  |  |  |  |  |  |  | $ (149,418) | $ (72,796) | $ (65,513)

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- Definition 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. + References 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) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 + Details
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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=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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