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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement [Abstract]    
Revenues $ 1,585,710 $ 1,328,764
Cost of services (including depreciation) 1,347,437 1,142,700
Gross profit 238,273 186,064
Selling, general and administrative expenses 113,681 98,108
Amortization of intangible assets 5,301 9,165
Operating income 119,291 78,791
Interest expense (502) (575)
Interest income 522 408
Other income (expense), net (513) 130
Income from continuing operations before income taxes 118,798 78,754
Provision for income taxes 41,941 28,669
Net income from continuing operations 76,857 50,085
Loss from discontinued operations, net of taxes   (91)
Net income 76,857 49,994
Less: Net income attributable to noncontrolling interests 4,776 4,287
Net income attributable to common stock 72,081 45,707
Amounts attributable to common stock:    
Net income from continuing operations 72,081 45,798
Net loss from discontinued operations   (91)
Net income attributable to common stock $ 72,081 $ 45,707
Earnings per share attributable to common stock-basic and diluted:    
Continuing operations $ 0.34 $ 0.22
Discontinued operations      
Net income attributable to common stock $ 0.34 $ 0.22
Shares used in computing earnings per share:    
Weighted average basic shares outstanding 213,453 211,481
Weighted average diluted shares outstanding 213,512 211,592