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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,483,718 $ 2,208,699
Accumulated Amortization 1,827,563 1,805,813
Goodwill gross carrying amount 1,958,837 1,800,130
Goodwill accumulated amortization 253,536 253,536
Customer Lists and Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 553,263 513,832
Accumulated Amortization $ 480,418 477,006
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 $ 64,538 64,514
Accumulated Amortization $ 63,521 63,453
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 $ 1,851,909 1,616,345
Accumulated Amortization $ 1,270,085 1,251,825
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 $ 14,008 14,008
Accumulated Amortization $ 13,539 $ 13,529
Other [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life (Years) 5 years  
Other [Member] | Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated Life (Years) 15 years