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Shareholders' Equity (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 52 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Jul. 23, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,144,773 |
Share repurchase plan expiration date |  |  | Aug. 09, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Daily repurchase of shares, maximum |  |  |  |  |  |  |  |  |  |  | 112,638 |  |  |  |  |
Average daily trading volume during period |  |  |  |  |  |  |  |  |  |  | 450,555 |  |  |  |  |
Repurchase of common stock (shares) |  |  |  |  |  |  |  |  |  |  |  | 1,271,977 | 0 |  |  |
Aggregate cost of stock repurchased |  |  |  |  |  | $ 105,654 |  |  |  |  |  | $ 105,654 |  |  |  |
Maximum remaining number of shares available for repurchase |  |  | 11,912,497 | 11,912,497 |  |  |  |  |  | 11,912,497 |  | 11,912,497 |  | 11,912,497 |  |
Cash dividend per share | $ 0.185 | $ 0.16 |  | $ 0.185 |  |  | $ 0.160 |  |  |  |  | $ 0.555 | $ 0.480 |  |  |
Cash dividend per common share, increase | $ 0.025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends on common stock |  |  |  | $ 49,009 | $ 48,894 | $ 48,018 | $ 42,133 | $ 42,131 | $ 42,084 |  |  | $ 145,921 | $ 126,348 |  |  |
Employee Share Purchase Plan 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum percent of eligible compensation to purchase shares |  |  | 1.00% | 1.00% |  |  |  |  |  | 1.00% |  | 1.00% |  | 1.00% |  |
Maximum percent of eligible compensation to purchase shares |  |  | 10.00% | 10.00% |  |  |  |  |  | 10.00% |  | 10.00% |  | 10.00% |  |
Maximum number of share authorized to be issued under plan |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |
Number of common shares purchased under plan |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Minimum [Member] | Employee Share Purchase Plan 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price percentage of closing price of common shares |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |
Maximum [Member] | Employee Share Purchase Plan 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price percentage of closing price of common shares |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value of award |  |  |  |  |  |  |  |  |  |  |  | $ 101.80 |  |  |  |
Units granted in period |  |  |  |  |  |  |  |  |  |  |  | 326,045 |  |  |  |
Vested deferred RSUs outstanding |  | 247,999 | 178,119 | 178,119 |  |  | 247,999 |  |  | 178,119 |  | 178,119 | 247,999 | 178,119 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | $ 87.19 |  |  |  |
Performance period end date |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2022 |  |  |  |
Units granted in period |  |  |  |  |  |  |  |  |  |  |  | 211,987 |  |  |  |
Performance Shares [Member] | 2020 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] | 2020 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] | Minimum [Member] | 2020 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] | 2020 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 |  |  |  |  |  |  |  |  |  |  |  | $ 103.81 |  |  |  |
Units granted in period |  |  |  |  |  |  |  |  |  |  |  | 2,616 |  |  |  |
Vested deferred RSUs outstanding |  |  | 21,586 | 21,586 |  |  |  |  |  | 21,586 |  | 21,586 |  | 21,586 |  | 18,970
Progressive Waste Solutions Ltd. [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested deferred RSUs outstanding |  |  | 66,554 | 66,554 |  |  |  |  |  | 66,554 |  | 66,554 |  | 66,554 |  | 73,884

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