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Selected Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, 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
Quarterly Financial Data [Line Items]                      
Revenue $ 801,023 $ 804,888 $ 778,312 $ 739,885 $ 762,775 $ 752,179 $ 751,201 $ 485,379 $ 3,124,108 $ 2,751,534 $ 1,833,737
Gross margin 93,379 91,587 87,358 83,742 83,811 86,701 84,729 57,307 356,066 312,548 213,433
Operating income 31,648 30,351 27,850 22,511 27,138 26,643 23,918 16,760 112,360 94,459 69,882
Net income $ 18,844 $ 18,495 $ 16,952 $ 13,662 $ 17,014 $ 16,276 $ 14,390 $ 10,498 $ 67,953 $ 58,178 $ 43,458
Basic earnings per share $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 1.83 $ 1.58 $ 1.17
Diluted earnings per share $ 0.51 $ 0.50 $ 0.46 $ 0.37 $ 0.46 $ 0.44 $ 0.39 $ 0.28 $ 1.83 $ 1.57 $ 1.16