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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		5 Months Ended	6 Months Ended	12 Months Ended			67 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Jul. 27, 2021	Jun. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common shares					3,003,822	1,271,977	0
Aggregate cost of common shares repurchase					$ 338,993	$ 105,654
Aggregate cost of common stock repurchase
Cash dividend per share	$ 0.23	$ 0.205			$ 0.845	$ 0.760	$ 0.665
Cash dividend per common share, increase	$ 0.025
Cash dividends on common stock					$ 220,203	$ 199,883	$ 175,067
Maximum remaining number of shares available for repurchase			12,768,063		12,768,063			12,768,063
Maximum number of shares authorized for repurchase									13,025,895
Share repurchase plan expiration date			Aug. 09, 2022
Daily repurchase of shares maximum				75,704
Daily Shares Repurchase (as percentage)			25.00%		25.00%			25.00%
Average daily trading volume during period				302,816
Common shares, shares issued			260,283,158		260,283,158	262,899,174		260,283,158
Preferred stock, shares issued			0		0	0	0	0
Issuance of shares under employee share purchase plan, shares					10,813
Issuance of shares under employee share purchase plan					$ 1,222
Employee Share Purchase Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percent of eligible compensation to purchase shares			1.00%		1.00%			1.00%
Maximum percent of eligible compensation to purchase shares			10.00%		10.00%			10.00%
Maximum number of share authorized to be issued under plan			1,000,000		1,000,000			1,000,000
2016 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of share authorized to be issued under plan			7,500,000		7,500,000			7,500,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration					2022
Minimum [Member] \| Employee Share Purchase Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price percentage of closing price of common share					85.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant expiration					2026
Maximum [Member] \| Employee Share Purchase Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price percentage of closing price of common share					95.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested deferred RSUs outstanding			100,861		100,861	177,760	247,999	100,861
Restricted Stock Units (RSUs) [Member] \| 2004 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period					0	0	0
Restricted Stock Units (RSUs) [Member] \| Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period								0
Performance Shares [Member] \| 2019 Performance Based Restricted Share Units Plan One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							3 years
Performance period end date							Dec. 31, 2021
Performance Shares [Member] \| 2019 Performance-Based Restricted Share Units Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							3 years
Performance Shares [Member] \| 2021 Performance Based Restricted Share Units Plan One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award					3 years
Performance period end date					Dec. 31, 2023
Performance Shares [Member] \| 2020 Performance Based Restricted Share Units Plan One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award						3 years
Performance period end date						Dec. 31, 2022
Performance Shares [Member] \| 2020 Performance Based Restricted Share Units Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award						3 years
Performance Shares [Member] \| Minimum [Member] \| 2019 Performance-Based Restricted Share Units Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							1 year
Performance Shares [Member] \| Minimum [Member] \| 2020 Performance Based Restricted Share Units Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award						1 year
Performance Shares [Member] \| Maximum [Member] \| 2019 Performance-Based Restricted Share Units Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							4 years
Performance Shares [Member] \| Maximum [Member] \| 2020 Performance Based Restricted Share Units Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award						4 years
Special Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, shares issued			0		0	0	0	0
Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested deferred RSUs outstanding			24,442		24,442	21,586		24,442
Restricted Share Units and Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common shares held in trust, shares					3,522	7,330	48,375
Restricted Share Units and Deferred Share Units [Member] \| Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Acquired common shares held in trust			70,662		70,662			70,662		735,171
Progressive Waste Solutions Ltd. [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested deferred RSUs outstanding			63,032		63,032	66,554		63,032
Progressive Waste Solutions Ltd. [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option awards granted in period								0