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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