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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Revenues $ 2,417,576 $ 2,178,170
Cost of services (including depreciation) 2,116,528 1,911,982
Gross profit 301,048 266,188
Selling, general and administrative expenses 215,422 184,552
Amortization of intangible assets 10,405 6,562
Operating income 75,221 75,074
Interest expense (6,778) (3,965)
Interest income 146 287
Other income (expense), net (11,975) (364)
Income before income taxes 56,614 71,032
Provision for income taxes 18,003 22,592
Net income 38,611 48,440
Less: Net income attributable to non-controlling interests 997 173
Net income attributable to common stock $ 37,614 $ 48,267
Earnings per share attributable to common stock, basic and diluted (in usd per share) $ 0.24 $ 0.31
Weighted average basic shares outstanding (in shares) 156,546 155,168
Weighted average diluted shares outstanding (in shares) 157,556 155,168