Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,464,831	$ 3,416,914
Accumulated Amortization	2,403,440	2,371,737
Goodwill, Gross Carrying Amount	2,190,001	2,189,962
Goodwill, Accumulated Amortization	253,536	253,536
Customer lists and contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	682,326	676,846
Accumulated Amortization	$ 593,833	587,056
Customer lists and contracts | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	7 years
Customer lists and contracts | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	10 years
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 69,587	69,276
Accumulated Amortization	$ 65,108	64,941
Non-competition agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	3 years
Non-competition agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Site locations
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,661,410	2,619,531
Accumulated Amortization	$ 1,704,839	1,680,333
Site locations | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 51,508	51,261
Accumulated Amortization	$ 39,660	$ 39,407
Other | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	2 years
Other | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Life (Years)	15 years