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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 3,140,339 $ 2,950,906
Accumulated Amortization 2,120,686 2,035,453
Goodwill gross carrying amount 2,156,221 2,172,922
Goodwill accumulated amortization 253,536 253,536
Customer Lists and Contracts [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 641,221 610,376
Accumulated Amortization $ 533,148 514,928
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 $ 65,983 65,771
Accumulated Amortization $ 64,312 64,119
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 $ 2,386,446 2,228,767
Accumulated Amortization $ 1,487,218 1,422,794
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 $ 46,689 45,992
Accumulated Amortization $ 36,008 $ 33,612
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