Acquisitions - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Nov. 19, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Amortization of intangible assets		$ 24,500	$ 22,100	$ 49,000	$ 44,800
Revenues		879,356	$ 979,459	1,754,053	$ 1,950,452
Braxton Science & Technology Group
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%
Cash paid to acquire	$ 309,500
Amortization of intangible assets		4,000		8,100
Goodwill deductible for tax purposes	$ 196,300
Revenues		$ 29,300		60,300
Selling, General and Administrative Expense | Braxton Science & Technology Group
Business Acquisition [Line Items]
Acquisition related expenses				$ 600