Acquisitions - Pro Forma Information (Details) - PLH and FIH - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pro forma results
Tax rate	18.60%	29.00%	19.60%	27.50%
Revenue	$ 1,339,477	$ 1,102,971	$ 3,485,099	$ 3,038,474
Income before provision for income taxes	62,760	59,194	101,760	43,679
Net income	$ 51,111	$ 42,220	$ 81,815	$ 31,669
Weighted average common shares outstanding:
Basic (in shares)	53,181	53,769	53,228	52,407
Diluted (in shares)	53,748	54,367	53,778	54,946
Earnings per share:
Basic (in dollars per share)	$ 0.96	$ 0.79	$ 1.54	$ 0.60
Diluted (in dollars per share)	$ 0.95	$ 0.78	$ 1.52	$ 0.58