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Acquisitions - Summary of Allocation of Purchase Price/Acquisition Costs (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 1,902,685 $ 1,919,386
2019 Acquisitions [Member]    
Business Acquisition [Line Items]    
Property, plant and equipment 35,973  
Goodwill 20,088  
Asset acquisition costs 697  
Current assets 2,260  
Current liabilities (1,845)  
Operating lease right of use assets 21,850  
Operating lease liabilities (20,149)  
Other assets 52  
Other liabilities (1,500)  
Total 215,869  
2019 Acquisitions [Member] | Site Locations [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets 135,658  
2019 Acquisitions [Member] | Non-competition Agreements [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets 210  
2019 Acquisitions [Member] | Customer Lists and Contracts [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets $ 22,575  
2018 Acquisitions Excluding Fairway Assets [Member]    
Business Acquisition [Line Items]    
Property, plant and equipment   8,648
Asset acquisition costs   336
Current assets   1,041
Current liabilities   (355)
Total   73,638
2018 Acquisitions Excluding Fairway Assets [Member] | Site Locations [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets   57,105
2018 Acquisitions Excluding Fairway Assets [Member] | Non-competition Agreements [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets   342
2018 Acquisitions Excluding Fairway Assets [Member] | Customer Lists and Contracts [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets   $ 6,521