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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Revenues $ 6,522,842 $ 5,920,269 $ 4,193,764
Cost of services (including depreciation) 5,467,389 4,982,562 3,632,048
Gross profit 1,055,453 937,707 561,716
Selling, general and administrative expenses 501,010 434,894 337,835
Amortization of intangible assets 27,515 37,691 29,039
Operating income 526,928 465,122 194,842
Interest expense (2,668) (3,746) (1,803)
Interest income 3,380 1,471 1,066
Equity in earnings of unconsolidated affiliates, including gain on sale of investment 112,744 2,084  
Other income (expense), net (1,135) (351) (597)
Income from continuing operations before income taxes 639,249 464,580 193,508
Provision for income taxes 217,940 158,859 63,096
Net income from continuing operations 421,309 305,721 130,412
Income from discontinued operations, net of taxes   16,935 14,004
Net income 421,309 322,656 144,416
Less: Net income attributable to noncontrolling interests 19,388 16,027 11,901
Net income attributable to common stock 401,921 306,629 132,515
Amounts attributable to common stock:      
Net income from continuing operations 401,921 289,694 118,511
Net income from discontinued operations   16,935 14,004
Net income attributable to common stock $ 401,921 $ 306,629 $ 132,515
Earnings per share attributable to common stock - basic and diluted:      
Continuing operations $ 1.87 $ 1.36 $ 0.56
Discontinued operations   $ 0.08 $ 0.06
Net income attributable to common stock $ 1.87 $ 1.44 $ 0.62
Shares used in computing earnings per share:      
Weighted average basic shares outstanding 214,929 212,777 212,648
Weighted average diluted shares outstanding 214,978 212,835 213,168