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Shareholders' Equity (Summary of Stock Option Activity and Related Information) (Detail) - Progressive Waste Solutions Ltd. [Member] | 9 Months Ended
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Sep. 30, 2018 shares
Number of Shares (Options) |
Outstanding at December 31, 2017 | 236,616
Cash settled | (71,460)
Outstanding at September 30, 2018 | 165,156

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