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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended						6 Months Ended	9 Months Ended		40 Months Ended
	Oct. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Jul. 25, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for repurchase														13,184,474
Share repurchase plan expiration date			Aug. 07, 2020
Daily repurchase of shares, maximum										79,933
Average daily trading volume during period										319,734
Repurchase of common stock (shares)											0	594,474
Aggregate cost of stock repurchased									$ 42,040			$ 42,040
Maximum remaining number of shares available for repurchase			13,184,474	13,184,474							13,184,474		13,184,474
Cash dividend per share	$ 0.16	$ 0.14		$ 0.16			$ 0.14				$ 0.48	$ 0.42
Cash dividend per common share, increase	$ 0.02
Cash dividends on common stock				$ 42,133	$ 42,131	$ 42,084	$ 36,863	$ 36,770	$ 36,814		$ 126,348	$ 110,447
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 81.15
Units granted in period											341,459
Vested deferred RSUs outstanding		264,374	247,999	247,999			264,374				247,999	264,374	247,999
Restricted Stock Units (RSUs) [Member] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted in period													0
RSUs forfeited, shares											964
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 80.85
Performance period end date											Dec. 31, 2021
Units granted in period											152,656
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 Shares [Member] | 2019 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] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted in period													0
Performance Shares [Member] | Minimum [Member] | 2019 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 Plan Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award											4 years
Employee Stock Option [Member] | Progressive Waste Solutions Ltd. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period													0
Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 83.80
Units granted in period											3,804
Vested deferred RSUs outstanding			18,970	18,970							18,970		18,970		17,176

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