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Acquisitions - Summary of Allocation of Purchase Price/Acquisition Costs (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 1,912,328 | $ 1,912,274
2020 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Property, plant and equipment | 13,376 |
Asset acquisition costs | 154 |
Current assets | 3 |
Current liabilities | (295) |
Operating right of use assets | 7,269 |
Operating lease liabilities | (6,368) |
Total | 46,160 |
2020 Acquisitions [Member] | Site Locations [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets | 27,902 |
2020 Acquisitions [Member] | Non-competition Agreements [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets | 140 |
2020 Acquisitions [Member] | Customer Lists and Contracts [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets | $ 3,979 |
2019 Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Property, plant and equipment |  | 37,988
Asset acquisition costs |  | 756
Goodwill |  | 29,360
Current assets |  | 1,860
Current liabilities |  | (832)
Operating right of use assets |  | 23,934
Operating lease liabilities |  | (21,573)
Other liabilities |  | (1,500)
Total |  | 227,588
2019 Acquisitions [Member] | Site Locations [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets |  | 131,208
2019 Acquisitions [Member] | Non-competition Agreements [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets |  | 240
2019 Acquisitions [Member] | Customer Lists and Contracts [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets |  | 23,032
2019 Acquisitions [Member] | Other Intangibles [Member] |  |
Business Acquisition [Line Items] |  |
Finite lived intangible assets |  | $ 3,115

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