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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenues $ 11,202,672 $ 12,112,153 $ 11,171,423
Cost of services (including depreciation) 9,541,825 10,511,901 9,691,459
Gross profit 1,660,847 1,600,252 1,479,964
Equity in earnings of integral unconsolidated affiliates 11,303 0 0
Selling, general and administrative expenses (975,074) (955,991) (857,574)
Amortization of intangible assets (76,704) (62,091) (43,994)
Asset impairment charges (8,282) (13,892) (49,375)
Change in fair value of contingent consideration liabilities (719) (13,404) 11,248
Operating income 611,371 554,874 540,269
Interest expense (45,013) (66,890) (36,945)
Interest income 2,449 927 1,555
Other income (expense), net 2,539 83,376 (47,213)
Income before income taxes 571,346 572,287 457,666
Provision for income taxes 119,387 165,472 161,659
Net income 451,959 406,815 296,007
Less: Net income attributable to non-controlling interests 6,363 4,771 2,661
Net income attributable to common stock $ 445,596 $ 402,044 $ 293,346
Earnings per share attributable to common stock:      
Basic (in dollars per share) $ 3.15 $ 2.76 $ 1.92
Diluted (in dollars per share) $ 3.07 $ 2.73 $ 1.90
Shares used in computing earnings per share:      
Weighted average basic shares outstanding (in shares) 141,380 145,710 152,963
Weighted average diluted shares outstanding (in shares) 145,247 147,534 154,226