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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Revenues $ 12,980,213 $ 11,202,672 $ 12,112,153
Cost of services (including depreciation) 11,026,954 9,541,825 10,511,901
Gross profit 1,953,259 1,660,847 1,600,252
Equity in earnings of integral unconsolidated affiliates 44,061 11,303 0
Selling, general and administrative expenses (1,155,956) (975,074) (955,991)
Amortization of intangible assets (165,366) (76,704) (62,091)
Asset impairment charges (5,743) (8,282) (13,892)
Change in fair value of contingent consideration liabilities (6,734) (719) (13,404)
Operating income 663,521 611,371 554,874
Interest and other financing expenses (68,899) (45,013) (66,890)
Interest income 3,194 2,449 927
Other income, net 25,085 2,539 83,376
Income before income taxes 622,901 571,346 572,287
Provision for income taxes 130,918 119,387 165,472
Net income 491,983 451,959 406,815
Less: Net income attributable to non-controlling interests 6,027 6,363 4,771
Net income attributable to common stock $ 485,956 $ 445,596 $ 402,044
Earnings per share attributable to common stock:      
Basic (in dollars per share) $ 3.45 $ 3.15 $ 2.76
Diluted (in dollars per share) $ 3.34 $ 3.07 $ 2.73
Shares used in computing earnings per share:      
Weighted average basic shares outstanding (in shares) 140,824 141,380 145,710
Weighted average diluted shares outstanding (in shares) 145,373 145,247 147,534