Acquisitions - Schedule of Business Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jul. 08, 2019	Dec. 31, 2018	Jan. 23, 2018
Business Acquisition [Line Items]
Goodwill	$ 339,702	$ 261,983		$ 233,619
Zenetex
Business Acquisition [Line Items]
Receivables	39,965
Other current assets	1,174
Property, plant and equipment	1,116
Goodwill	66,925
Intangible assets	33,200
Right-of-use assets	7,910
Accounts payable	(10,481)
Other current liabilities	(949)
Accrued compensation	(12,478)
Lease liabilities	(8,251)
Other non-current liabilities	(11)
Purchase price, net of cash acquired	$ 118,120
Advantor
Business Acquisition [Line Items]
Receivables			$ 11,388
Other current assets			2,719
Property, plant and equipment			155
Goodwill			28,511
Intangible assets			8,300
Other non-current assets			1,868
Accounts payable			(4,223)
Other current liabilities			(1,519)
Accrued compensation			(907)
Other non-current liabilities			(1,218)
Purchase price, net of cash acquired			$ 45,074
SENTEL
Business Acquisition [Line Items]
Receivables					$ 23,339
Other current assets					975
Property, plant and equipment					810
Goodwill					16,689
Intangible assets					10,500
Accounts payable					(10,012)
Other current liabilities					(5,446)
Purchase price, net of cash acquired					$ 36,855