Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]
Revenue from services	$ 414,035	$ 442,291	$ 540,695	$ 622,707	$ 628,218	$ 636,098	$ 753,561	$ 788,732	$ 2,019,728	$ 2,806,609	$ 1,676,652
Gross profit	90,489	97,359	123,139	139,423	138,942	143,545	170,405	174,794
Net income attributable to common stockholders	$ 9,038	$ 12,812	$ 21,345	$ 29,436	$ 38,791	$ 34,793	$ 52,894	$ 61,983	$ 72,631	$ 188,461	$ 132,002
Net income per share attributable to common stockholders - Basic (usd per share)	$ 0.26	$ 0.37	$ 0.60	$ 0.82	$ 1.06	$ 0.94	$ 1.41	$ 1.67	$ 2.07	$ 5.09	$ 3.60
Net income per share attributable to common stockholders - Diluted (usd per share)	$ 0.26	$ 0.36	$ 0.60	$ 0.81	$ 1.05	$ 0.93	$ 1.40	$ 1.63	$ 2.05	$ 5.02	$ 3.53
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges									$ 719	$ 5,597	$ 2,070
Restructuring costs	$ 900		$ 900			$ 2,500			2,553	1,861	2,630
Gain on lease termination							$ 1,100
Loss on early extinguishment of debt			$ 1,700		$ 1,800		$ 1,900		1,723	3,728	0
Legal settlement charges				$ 1,100					$ 1,125	$ 0	$ 0
Leased Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges						2,000		$ 1,700
IT Project
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges						$ 1,900