Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Aug. 23, 2023	Apr. 13, 2023	Dec. 31, 2022	May 31, 2022	Dec. 31, 2021	Jul. 06, 2021
Business Acquisition [Line Items]
Contract assets	$ 757,515			$ 634,033
Goodwill	1,792,665			1,661,850		$ 1,412,690
Investments in and advances to unconsolidated joint ventures	128,204			107,425
Contract liabilities	$ (301,107)			$ (213,064)
Sealing Technologies, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents		$ 8,133
Accounts receivable		17,889
Contract assets		2,946
Prepaid expenses and other current assets		1,379
Property and equipment		2,025
Right of use assets, operating leases		1,836
Deferred tax assets		357
Goodwill		90,593
Intangible assets		75,000
Accounts payable		(15,987)
Accrued expenses and other current liabilities		(2,408)
Contract liabilities		(668)
Short-term lease liabilities, operating leases		(418)
Long-term lease liabilities, operating leases		(1,418)
Net assets acquired		$ 179,259
IPKeys Power Partners
Business Acquisition [Line Items]
Cash and cash equivalents			$ 126
Accounts receivable			3,937
Contract assets			834
Prepaid expenses and other current assets			455
Property and equipment			86
Right of use assets, operating leases			1,105
Goodwill			22,407
Intangible assets			23,000
Other noncurrent assets			152
Accounts payable			(541)
Accrued expenses and other current liabilities			(1,768)
Contract liabilities			(1,936)
Short-term lease liabilities, operating leases			(343)
Long-term lease liabilities, operating leases			(762)
Deferred tax liabilities			(3,713)
Net assets acquired			$ 43,039
Xator Corporation
Business Acquisition [Line Items]
Cash and cash equivalents					$ 8,935
Accounts receivable					7,393
Contract assets					24,332
Prepaid expenses and other current assets					3,615
Property and equipment					1,699
Right of use assets, operating leases					7,517
Goodwill					257,934
Investments in and advances to unconsolidated joint ventures					698
Intangible assets					123,500
Other noncurrent assets					9,156
Accounts payable					(6,626)
Accrued expenses and other current liabilities					(31,309)
Contract liabilities					(2,631)
Short-term lease liabilities, operating leases					(2,371)
Long-term lease liabilities, operating leases					(5,146)
Other long-term liabilities					(9,156)
Net assets acquired					$ 387,540
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Cash and cash equivalents							$ 15,428
Accounts receivable							3,351
Contract assets							5,979
Prepaid expenses and other current assets							937
Property and equipment							2,239
Right of use assets, operating leases							6,157
Goodwill							143,086
Intangible assets							65,000
Accounts payable							(2,326)
Accrued expenses and other current liabilities							(17,190)
Contract liabilities							(320)
Short-term lease liabilities, operating leases							(1,011)
Long-term lease liabilities, operating leases							(5,146)
Deferred tax liabilities							(10,916)
Other long-term liabilities							(235)
Net assets acquired							$ 205,033