Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets acquired:
Goodwill	$ 495,724	$ 484,941
2019 Acquisitions
Assets acquired:
Cash	89
Accounts receivable	7,690
Other receivables	2,165
Inventories	4,027
Prepaid and other current assets	26
Property and equipment	1,057
Goodwill	9,403
Intangible assets	16,635
Other assets	0
Total assets acquired	41,092
Liabilities assumed:
Accounts payable	(3,905)
Deferred tax liability	(1,541)
Accrued expenses and other current liabilities	(1,806)
Total liabilities assumed	(7,252)
Total net assets acquired	$ 33,840
2018 Acquisitions
Assets acquired:
Cash		672
Accounts receivable		19,450
Other receivables		1,470
Inventories		11,558
Prepaid and other current assets		73
Property and equipment		9,843
Goodwill		34,314
Intangible assets		25,812
Other assets		74
Total assets acquired		103,266
Liabilities assumed:
Accounts payable		(7,162)
Deferred tax liability		(1,019)
Accrued expenses and other current liabilities		(936)
Total liabilities assumed		(9,117)
Total net assets acquired		$ 94,149