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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 3,161,941 $ 3,142,112
Accumulated Amortization 2,232,258 2,149,868
Goodwill gross carrying amount 2,165,746 2,165,810
Goodwill accumulated amortization 253,536 253,536
Customer Lists and Contracts [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 644,684 641,714
Accumulated Amortization $ 557,239 539,405
Customer Lists and Contracts [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 7 years  
Customer Lists and Contracts [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 10 years  
Non-competition Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 66,102 66,014
Accumulated Amortization $ 64,579 64,379
Non-competition Agreements [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 3 years  
Non-competition Agreements [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 15 years  
Site Locations [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,401,175 2,384,520
Accumulated Amortization $ 1,572,008 1,509,335
Site Locations [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 15 years  
Other [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 49,980 49,864
Accumulated Amortization $ 38,432 $ 36,749
Other [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 2 years  
Other [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated Life (Years) 15 years