Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Project and non-project reserves	$ 23,555	$ 20,862
Employee compensation and benefits	69,726	55,103
Revenue and cost recognition	37,616	43,629
Insurance accruals	14,081	14,067
Net operating losses	8,663	8,928
Lease liabilities	44,626	44,285
Tax credit carryforwards	31,727	22,333
Other	3,285	3,847
Total deferred tax assets	233,279	213,054
Valuation allowance	(34,779)	(28,705)
Total deferred tax assets	198,500	184,349
Deferred tax liabilities
Intangible assets	(18,783)	(12,131)
Right-of-use assets	(40,131)	(40,111)
Profit remittance tax	(5,822)	(5,498)
Other	(3,378)	(1,370)
Total deferred tax liabilities	(68,114)	(59,110)
Net deferred tax asset	$ 130,386	$ 125,239