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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Revenues $ 2,171,144 $ 1,645,132 $ 5,798,268 $ 4,705,219
Cost of services (including depreciation) 1,818,173 1,372,079 4,891,778 3,952,609
Gross profit 352,971 273,053 906,490 752,610
Selling, general and administrative expenses 200,521 124,949 513,292 357,661
Amortization of intangible assets 9,538 7,026 26,398 17,406
Operating income 142,912 141,078 366,800 377,543
Interest expense (1,321) (475) (3,431) (1,480)
Interest income 902 1,139 3,046 2,230
Other income (expense), net (378) (824) (968) (1,690)
Income before income taxes 142,115 140,918 365,447 376,603
Provision for income taxes 42,100 42,509 121,340 126,611
Net income 100,015 98,409 244,107 249,992
Less: Net income attributable to non-controlling interests 5,367 5,503 13,969 14,768
Net income attributable to common stock $ 94,648 $ 92,906 $ 230,138 $ 235,224
Earnings per share attributable to common stock-basic and diluted $ 0.43 $ 0.43 $ 1.05 $ 1.10
Shares used in computing earnings per share:        
Weighted average basic shares outstanding 219,492 214,866 219,395 214,178
Weighted average diluted shares outstanding 219,517 214,916 219,420 214,229