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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)