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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenues $ 2,985,281 $ 2,609,307 $ 8,059,205 $ 6,987,851
Cost of services (including depreciation) 2,559,451 2,258,676 6,998,956 6,068,867
Gross profit 425,830 350,631 1,060,249 918,984
Selling, general and administrative expenses 224,040 201,224 645,566 571,656
Amortization of intangible assets 10,623 8,979 31,535 22,035
Change in fair value of contingent consideration liabilities (1,394) 0 (7,673) 0
Operating income 192,561 140,428 390,821 325,293
Interest expense (9,219) (6,058) (25,175) (14,294)
Interest income 322 196 1,128 647
Other income (expense), net (15,498) (2,371) (37,899) (3,814)
Income before income taxes 168,166 132,195 328,875 307,832
Provision for income taxes 43,267 42,346 90,659 105,183
Net income 124,899 89,849 238,216 202,649
Less: Net income attributable to non-controlling interests 348 536 1,686 1,232
Net income attributable to common stock $ 124,551 $ 89,313 $ 236,530 $ 201,417
Earnings per share attributable to common stock:        
Basic (in dollars per share) $ 0.82 $ 0.57 $ 1.54 $ 1.29
Diluted (in dollars per share) $ 0.81 $ 0.56 $ 1.52 $ 1.28
Shares used in computing earnings per share:        
Weighted average basic shares outstanding (in shares) 152,562 157,484 154,087 155,796
Weighted average diluted shares outstanding (in shares) 153,687 158,620 155,198 156,793