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Goodwill and Intangible Assets - Schedule of Activity and Balances Related to Goodwill by Reporting Segment (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Goodwill [Line Items]      
Goodwill, beginning balance $ 119,139 $ 119,170 $ 115,928
Other   (194)  
Acquisitions 31   3,183
Goodwill, ending balance 119,170 118,976 119,139
BBI Acquisition [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 3,183 31 14,222
Other     28
Goodwill, ending balance 31   3,183
Eastern Region [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 17,429 17,429 16,858
Acquisitions     539
Goodwill, ending balance 17,429 17,429 17,429
Eastern Region [Member] | BBI Acquisition [Member]      
Goodwill [Line Items]      
Other     32
Western Region [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 87,666 87,697 86,880
Other   (194)  
Acquisitions 31   790
Goodwill, ending balance 87,697 87,503 87,666
Western Region [Member] | BBI Acquisition [Member]      
Goodwill [Line Items]      
Other     (4)
Recycling [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 12,315 12,315 12,190
Acquisitions     125
Goodwill, ending balance 12,315 12,315 12,315
Other [Member]      
Goodwill [Line Items]      
Goodwill, beginning balance 1,729 1,729  
Acquisitions     1,729
Goodwill, ending balance $ 1,729 $ 1,729 $ 1,729