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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended				6 Months Ended			37 Months Ended
	Jul. 24, 2018	Oct. 31, 2018	Sep. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jul. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for repurchase	13,174,976
Share repurchase plan expiration date	Aug. 07, 2019
Daily repurchase of shares, maximum									71,114
Average daily trading volume during period									284,459
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				12,937,746				12,937,746			12,937,746
Cash dividend per share		$ 0.16	$ 0.14	$ 0.16		$ 0.14		$ 0.32		$ 0.28
Cash dividend per common share, increase		$ 0.02
Cash dividends on common stock				$ 42,131	$ 42,084	$ 36,770	$ 36,814	$ 84,215		$ 73,584
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award								$ 81.12
Units granted in period								340,198
Vested deferred RSUs outstanding				249,003		349,799		249,003		349,799	249,003
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								$ 82.82
Units granted in period								3,300
Vested deferred RSUs outstanding				18,466				18,466			18,466	17,176

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