Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) Landfill	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items]
Post-closure period		30 years
Historical rate of consumer price index		2.50%
Average period changes in historical consumer price index		25 years
Weighted-average rate applicable to asset retirement obligations, minimum		4.20%
Weighted-average rate applicable to asset retirement obligations, maximum		7.70%
Active landfills | Landfill		41
Goodwill impairment charges		$ 0	$ 0	$ 0
Landfill site costs
Variable Interest Entity [Line Items]
Landfill site costs		0
Landfill impairments		$ 0	$ 0	$ 0
Deemed Permitted Airspace
Variable Interest Entity [Line Items]
Active landfills | Landfill		16
Accounting Standards Update 2017-12
Variable Interest Entity [Line Items]
Cumulative effect on retained earnings, net of tax	$ 400,000