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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

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