Landfill Accounting (Narrative) (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) site $ / T	Sep. 30, 2021 USD ($) $ / T	Dec. 31, 2021 USD ($)
Landfill Accounting [Line Items]
Number of landfills owned and operated by company | site	86
Number of landfills operated, not owned, under life-of-site operating agreements | site	5
Number of landfills operated under limited-term operating agreements | site	5
Property and equipment, net	$ 6,353,367		$ 5,721,949
Average remaining landfill life based on permitted capacity and projected annual disposal volumes	30 years
Number of owned landfills the company is seeking to expand | site	8
Number of landfills operated under life-of-site operating agreements that the company is seeking to expand | site	2
Average remaining landfill life based on permitted capacity, projected annual disposal volumes and probable expansion capacity	34 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	330 years
Percentage of projected annual disposal volume from landfills with remaining lives within threshold period	90.00%
Threshold period used for measurement of projected annual disposal volume from landfills	70 years
Landfill depletion expense	$ 172,118	$ 160,470
Average rate per ton consumed related to landfill depletion at owned landfills and landfills operated under life-of-site agreements | $ / T	4.88	4.56
Accretion expense associated with landfill obligations	$ 12,008	$ 10,783
Average rate per ton consumed related to final capping, closure and post-closure landfill accretion expense | $ / T	0.34	0.31
Restricted cash	$ 108,194		72,174
Restricted investments	55,922		$ 59,014
Liability adjustments	36,152
Landfill [Member]
Landfill Accounting [Line Items]
Property and equipment, net	$ 2,949,498
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations	2.25%		2.25%
Restricted cash	$ 10,632		$ 12,609
Restricted investments	$ 53,243		$ 56,289
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	3.25%		3.25%