Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Jul. 06, 2021
Business Acquisition [Line Items]
Contract assets	$ 600,109	$ 579,216
Goodwill	1,412,834	1,412,690
Contract liabilities	$ (172,932)	$ (171,671)
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