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Business Disposition - Schedule of Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Impairment of long lived assets held for use |  | $ 170.6
Waste Management |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Impairment of long lived assets held for use | $ 170.6 | $ 170.6

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