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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 21,599 $ 33,168 $ 33,094 $ 34,065
Depletion expense on operating lease contracts 7,799 9,428 9,948 9,372
Property, Plant and Equipment [Member] | ABL Facility [Member]        
Property, Plant and Equipment [Line Items]        
Debt eligible collateral amount   103,904    
Landfills [Member]        
Property, Plant and Equipment [Line Items]        
Amortization expense 17,912 26,969 24,689 21,206
Depletion expense on operating lease contracts $ 7,799 $ 9,428 $ 9,948 $ 9,372