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Business Disposition - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 26, 2018
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |
Impairment of long lived assets held for use |  |  |  |  | $ 170.6 |
WCS | Contran Credit Facility | Contran | Amounts Acquired in Business Divestiture |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |
Acquired trade receivable | $ 36.3 |  |  | $ 36.3 |  | $ 36.3
Waste Management |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations |  |  |  | 58.4 |  |
Gain from disposal of discontinued operations, net of tax | 0.7 |  |  | 39.3 |  |
Impairment of long lived assets held for use |  |  | $ 170.6 |  | $ 170.6 |
Waste Management | Contran Credit Facility |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |
Noncash borrowings | $ 36.3 |  |  | $ 36.3 |  | $ 36.3
Waste Management | Discontinued Operations |  |  |  |  |  |
Business Combinations Discontinued Operations And Related Transactions [Line Items] |  |  |  |  |  |
Pre-tax gain from disposal of discontinued operations |  | $ 58.0 |  |  |  |
Gain from disposal of discontinued operations, net of tax |  | $ 39.3 |  |  |  |
Gain on disposal of discontinued operations, per diluted share, net of tax |  | $ 0.11 |  |  |  |

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