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Asset Impairments and Unusual Items - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Waste Diversion Technology Company [Member]    
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items]    
Equity method investments impairment charges   $ 28
Investment in Waste Diversion Technology Company [Member] | Other, net [Member]    
Income Expense From Divestitures Asset Impairments And Unusual Items [Line Items]    
Impairment charges $ 41