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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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