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Shareholders' Equity (Summary of Activity Related to Restricted Stock Units) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding shares beginning balance	177,760	247,999
Outstanding, shares beginning balance	772,625
Granted	498,078
Forfeited	(65,528)
Vested and issued	343,480
Outstanding, shares ending balance	100,861	177,760	247,999
Outstanding, shares, ending balance	861,695	772,625
Weighted-Average Grant Date Fair Value Per Share
Outstanding, beginning balance	$ 84.61
Granted	100.27	$ 101.79	$ 81.24
Forfeited	94.63
Vested and Issued	77.76
Outstanding, ending balance	$ 95.63	$ 84.61
Performance Shares [Member]
Unvested shares
Outstanding, shares beginning balance	434,558
Granted	116,784
Forfeited	(5,048)
Vested and issued	154,251
Outstanding, shares, ending balance	392,043	434,558
Weighted-Average Grant Date Fair Value Per Share
Outstanding, beginning balance	$ 82.60
Granted	96.99	$ 87.19	80.85
Forfeited	68.58
Vested and Issued	71.01
Outstanding, ending balance	$ 91.63	$ 82.60
Deferred Share Units [Member]
Unvested shares
Outstanding shares beginning balance	21,586
Granted	2,856
Outstanding, shares ending balance	24,442	21,586
Weighted-Average Grant Date Fair Value Per Share
Outstanding, beginning balance	$ 59.32
Granted	99.80	$ 103.81	$ 83.80
Outstanding, ending balance	$ 64.05	$ 59.32
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member]
Unvested shares
Outstanding shares beginning balance	66,554
Cash settled	(3,522)
Outstanding, shares ending balance	63,032	66,554

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The number of equity instruments other than options cash settled in the period.

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The weighted average grant date fair value per share of deferred share units outstanding.

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