Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Consolidated Operating Results by Quarter (Detail)

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Quarterly Financial Data - Consolidated Operating Results by Quarter (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
Interim Reporting [Line Items]                      
Revenues $ 1,673,342 $ 1,532,001 $ 1,386,162 $ 1,328,764 $ 1,393,004 $ 1,112,674 $ 904,781 $ 783,305 $ 5,920,269 $ 4,193,764 $ 3,629,433
Gross profit 286,739 252,000 212,904 186,064 179,291 172,055 140,795 69,575 937,707 561,716 589,521
Net income 102,009 100,856 69,797 49,994 70,808 55,600 34,313 (16,305) 322,656 144,416 155,557
Net income attributable to common stock 98,986 96,398 65,538 45,707 66,314 51,994 31,801 (17,594) 306,629 132,515 153,176
Net income from continuing operations $ 102,350 $ 83,628 $ 57,918 $ 45,798 $ 58,715 $ 44,256 $ 28,674 $ (13,134) $ 289,694 $ 118,511 $ 142,693
Continuing operations - Basic $ 0.48 $ 0.39 $ 0.27 $ 0.22 $ 0.28 $ 0.21 $ 0.13 $ (0.06) $ 1.36 $ 0.56 $ 0.68
Continuing operations - Diluted $ 0.48 $ 0.39 $ 0.27 $ 0.22 $ 0.28 $ 0.21 $ 0.13 $ (0.06) $ 1.36 $ 0.56 $ 0.67