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Summary of Significant Accounting Policies - Investments in Unconsolidated Entities - Additional Information (Detail) - USD ($)
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Summary Of Significant Accounting Policies [Line Items]        
Investments under equity method of accounting $ 0 $ 0 $ 0  
Net cash proceeds     3,442,000  
Gain on sale of equity method investment 0 0 593,000  
Gain through loss from equity method investments $ 0 $ 0 (936,000) $ (4,441,000)
GreenFiber [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Sale of equity method investment     18,000,000  
Gross cash proceeds     19,194,000  
Adjustment of working capital     1,194,000  
Net cash proceeds     3,442,000  
Unrealized losses relating to derivative instruments     593,000  
Gain on sale of equity method investment     $ 593,000  
Equity method investment membership interest     50.00%  
Tompkins County Recycling LLC [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Equity contribution     $ 425,000  
Price to purchase acquired assets prior to the acquisition date     300,000  
Gain through loss from equity method investments     $ 106,000  
Equity method investment membership interest     50.00%