Acquisitions - Schedule of Business Acquisitions, by Acquisition (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Asset Acquisition [Line Items]
Goodwill	$ 1,926,919	$ 1,912,328
2021 Acquisitions
Asset Acquisition [Line Items]
Property, plant and equipment	15,949
Goodwill	14,584
Asset acquisition costs	139
Current assets	218
Current liabilities	(911)
Operating lease right of use assets	12,274
Operating lease liabilities	(11,521)
Business combination, recognized identifiable assets acquired, goodwill, and liabilities assumed, net, total	107,593
2021 Acquisitions | Site locations
Asset Acquisition [Line Items]
Finite-lived intangible assets	66,321
2021 Acquisitions | Non-competition agreements
Asset Acquisition [Line Items]
Finite-lived intangible assets	440
2021 Acquisitions | Customer lists and contracts
Asset Acquisition [Line Items]
Finite-lived intangible assets	$ 10,100