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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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