Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 540,215	$ 460,333	$ 1,490,965	$ 1,292,651
Cost of services	411,406	340,068	1,123,572	985,046
Gross profit	128,809	120,265	367,393	307,605
Selling, general and administrative expenses	80,812	67,135	226,231	191,703
Amortization of intangible assets	8,948	7,140	23,127	22,192
Income from operations	39,049	45,990	118,035	93,710
Loss on foreign currency forward contracts	0	0	(5,917)	0
Interest expense — net	(11,707)	(9,153)	(26,695)	(27,749)
Income before income tax	27,342	36,837	85,423	65,961
Income tax expense	(9,094)	(10,018)	(22,824)	(13,195)
Net income	$ 18,248	$ 26,819	$ 62,599	$ 52,766
Earnings per common share:
Common stock — basic (in dollars per share)	$ 0.32	$ 0.44	$ 1.06	$ 0.87
Common stock — diluted (in dollars per share)	$ 0.31	$ 0.44	$ 1.06	$ 0.86
Weighted average common shares outstanding:
Common stock — basic (in shares)	57,664,895	60,218,090	58,624,221	60,454,855
Common stock — diluted (in shares)	57,740,013	60,743,765	58,802,742	61,058,843
Cost, Product and Service [Extensible Enumeration]	Service [Member]	Service [Member]	Service [Member]	Service [Member]