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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended	9 Months Ended		28 Months Ended
	Jul. 24, 2018	Oct. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jul. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
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)							594,474	0
Aggregate cost of stock repurchased							$ 42,040
Maximum remaining number of shares available for repurchase				12,587,332			12,587,332		12,587,332
Cash dividend per share		$ 0.14	$ 0.12	$ 0.14	$ 0.12		$ 0.42	$ 0.36
Cash dividend per common share, increase		$ 0.02
Cash dividends on common stock							$ 110,447	$ 95,201
Dividends per share amount				$ 0.14
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award							$ 69.22
Units granted in period							496,217
Vested deferred RSUs outstanding			352,214	264,374	352,214		264,374	352,214	264,374
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
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award							$ 69.04
Performance period end date							Dec. 31, 2020
Units granted in period							178,377
Performance Shares [Member] | 2018 Performance Based Restricted Share Units Grant One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							3 years
Performance Shares [Member] | 2018 Performance Based Restricted Share Units Grant Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award							1 year
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] | Maximum [Member] | 2018 Performance Based Restricted Share Units Grant 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							$ 70.47
Units granted in period							4,038
Vested deferred RSUs outstanding				17,176			17,176		17,176	13,138

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Aggregate dividends paid during the period for each share of common stock outstanding.

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