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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Revenues $ 1,762,574 $ 1,585,710
Cost of services (including depreciation) 1,490,503 1,347,437
Gross profit 272,071 238,273
Selling, general and administrative expenses 173,331 113,681
Amortization of intangible assets 8,245 5,301
Operating income 90,495 119,291
Interest expense (982) (502)
Interest income 1,545 522
Other income (expense), net 643 (513)
Income before income taxes 91,701 118,798
Provision for income taxes 33,053 41,941
Net income 58,648 76,857
Less: Net income attributable to noncontrolling interests 4,240 4,776
Net income attributable to common stock $ 54,408 $ 72,081
Earnings per share attributable to common stock - basic and diluted $ 0.25 $ 0.34
Shares used in computing earnings per share:    
Weighted average basic shares outstanding 219,033 213,453
Weighted average diluted shares outstanding 219,075 213,512