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Landfill Accounting (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
site
$ / T
Mar. 31, 2019
USD ($)
$ / T
Dec. 31, 2019
USD ($)
Landfill Accounting [Line Items]      
Number of landfills owned and operated by company | site 82    
Number of landfills operated, not owned, under life-of-site operating agreements | site 6    
Number of landfills operated under limited-term operating agreements | site 4    
Number of landfills in development stage | site 1    
Property and equipment, net $ 5,415,989   $ 5,516,347
Average remaining landfill life based on permitted capacity and projected annual disposal volumes 28 years    
Number of owned landfills the company is seeking to expand | site 6    
Number of landfills operated under life-of-site operating agreements that the company is seeking to expand | site 3    
Average remaining landfill life based on permitted capacity, projected annual disposal volumes and probable expansion capacity 31 years    
Life of Company's owned landfills and landfills operated under life-of-site operating agreements min range 1 year    
Life of Company's owned landfills and landfills operated under life of site operating agreements max range 204 years    
Landfill depletion expense $ 48,737 $ 48,580  
Average rate per ton consumed related to landfill depletion at owned landfills and landfills operated under life-of-site agreements | $ / T 4.49 4.74  
Accretion expense associated with landfill obligations $ 3,849 $ 3,434  
Average rate per ton consumed related to final capping, closure and post-closure landfill accretion expense | $ / T 0.36 0.34  
Restricted cash $ 88,927   96,483
Restricted investments 45,856   $ 51,179
Liabilities incurred 9,904    
Landfill [Member]      
Landfill Accounting [Line Items]      
Property and equipment, net $ 2,930,197    
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations 2.50%   2.50%
Restricted cash $ 16,842   $ 12,324
Restricted investments $ 43,253   $ 48,590
Landfill [Member] | Measurement Input, Discount Rate [Member]      
Landfill Accounting [Line Items]      
Discount rate for purposes of computing layers for final capping, closure and post-closure obligations 4.75%   4.75%