Acquisitions - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended
	May 31, 2022	Jul. 30, 2021	Jul. 06, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Business Acquisition [Line Items]
Amortization of intangible assets				$ 19,700	$ 24,500	$ 39,800	$ 49,000
Revenues				1,008,721	$ 879,356	1,957,790	$ 1,754,053
Goodwill				1,671,668		1,671,668		$ 1,412,690
Xator Corporation
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%
Cash paid to acquire	$ 388,300
Borrowed under credit agreement to partially fund the acquisition	300,000
Amortization of intangible assets				1,600		1,600
Revenues				20,800		20,800
Goodwill	$ 260,760
BlackHorse Solutions, Inc.
Business Acquisition [Line Items]
Percentage of ownership interest acquired			100.00%
Cash paid to acquire			$ 205,000
Amortization of intangible assets				3,500		7,100
Revenues				25,200		43,600
Goodwill deductible for tax purposes			10,600
Goodwill			$ 143,086
Echo Ridge LLC
Business Acquisition [Line Items]
Percentage of ownership interest acquired		100.00%
Cash paid to acquire		$ 9,000
Revenues				$ 1,600		$ 3,200
Goodwill		$ 7,200