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Selected Segment Financial Data (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 135,037 | $ 112,149 | $ 113,366 | $ 104,543 | $ 141,241 | $ 97,017 | $ 92,423 | $ 87,743 | $ 465,095 | $ 418,424 | $ 405,755
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 28,377 | 26,347 | 23,727
Stock-based compensation expense |  |  |  |  |  |  |  |  | 11,254 | 7,790 | 7,645
Operating income (loss) | 37,043 | 11,268 | 10,422 | 7,498 | 42,799 | 7,388 | 4,366 | (905) | 66,231 | 53,648 | 41,570
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 245,703 | 221,560 | 222,952
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 11,139 | 9,903 | 12,373
Stock-based compensation expense |  |  |  |  |  |  |  |  | 1,496 | 1,684 | 1,553
Operating income (loss) |  |  |  |  |  |  |  |  | 84,662 | 74,791 | 69,350
EMEA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 164,874 | 150,525 | 137,061
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 4,473 | 3,731 | 1,954
Stock-based compensation expense |  |  |  |  |  |  |  |  | 403 | 145 | 291
Operating income (loss) |  |  |  |  |  |  |  |  | 46,889 | 43,274 | 31,083
Asia /Pacific |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 54,518 | 46,339 | 45,742
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 3,410 | 3,126 | 1,300
Stock-based compensation expense |  |  |  |  |  |  |  |  | 418 | 425 | 429
Operating income (loss) |  |  |  |  |  |  |  |  | 6,774 | (60) | 6,293
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expense |  |  |  |  |  |  |  |  | 9,355 | 9,587 | 8,100
Stock-based compensation expense |  |  |  |  |  |  |  |  | 8,937 | 5,536 | 5,372
Operating income (loss) |  |  |  |  |  |  |  |  | $ (72,094) | $ (64,357) | $ (65,156)

X
- 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: 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 + 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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