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Consolidated Statements of Operations - USD ($)
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenues $ 9,466,478,000 $ 7,651,319,000 $ 7,572,436,000
Cost of services (including depreciation) 8,224,618,000 6,637,519,000 6,648,771,000
Gross profit 1,241,860,000 1,013,800,000 923,665,000
Selling, general and administrative expenses 777,920,000 653,338,000 592,863,000
Amortization of intangible assets 32,205,000 31,685,000 34,848,000
Asset impairment charges 58,057,000 7,964,000 58,451,000
Change in fair value of contingent consideration liabilities (5,171,000) 0 0
Operating income 378,849,000 320,813,000 237,503,000
Interest expense (20,946,000) (14,887,000) (8,024,000)
Interest income 832,000 2,423,000 1,493,000
Other income (expense), net (4,978,000) (663,000) (2,297,000)
Income from continuing operations before income taxes 353,757,000 307,686,000 228,675,000
Provision for income taxes 35,532,000 107,246,000 97,472,000
Net income from continuing operations 318,225,000 200,440,000 131,203,000
Net income (loss) from discontinued operations 0 (342,000) 190,621,000
Net income 318,225,000 200,098,000 321,824,000
Less: Net income attributable to non-controlling interests 3,247,000 1,715,000 10,917,000
Net income attributable to common stock 314,978,000 198,383,000 310,907,000
Amounts attributable to common stock:      
Net income from continuing operations 314,978,000 198,725,000 120,286,000
Net income (loss) from discontinued operations 0 (342,000) 190,621,000
Net income attributable to common stock $ 314,978,000 $ 198,383,000 $ 310,907,000
Basic earnings per share attributable to common stock:      
Continuing operations (in usd per share) $ 2.02 $ 1.26 $ 0.62
Discontinued operations (in usd per share) 0.00 0.00 0.97
Net income attributable to common stock (in usd per share) $ 2.02 $ 1.26 $ 1.59
Weighted average basic shares outstanding (in shares) 156,124 157,287 195,113
Diluted earnings per share attributable to common stock:      
Continuing operations (in usd per share) $ 2.00 $ 1.26 $ 0.62
Discontinued operations (in usd per share) 0.00 0.00 0.97
Net income attributable to common stock (in usd per share) $ 2.00 $ 1.26 $ 1.59
Weighted average diluted shares outstanding (in shares) 157,155 157,288 195,120