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Equity Method Investments - Narrative (Details) - USD ($)
 2 Months Ended 3 Months Ended 12 Months Ended
Mar. 03, 2016
Mar. 03, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 10, 2014
Dec. 31, 2013
Jan. 20, 2010
Schedule of Equity Method Investments [Line Items]                                
Earnings from equity method investments     $ 15,518,000 $ 10,735,000 $ 13,754,000 $ 5,577,000 $ 3,788,000 $ (41,000) $ 4,860,000 $ 314,000 $ 45,584,000 $ 8,921,000 $ 42,712,000      
Equity method investments     3,959,000       17,232,000       3,959,000 17,232,000        
Gain on sale of equity method investment                     2,078,000 0 0      
Purchase, contributions and advances to equity method investees                     223,000 2,128,000 6,631,000      
Purchase of membership interest, note payable outstanding     $ 0       $ 28,025,000       0 28,025,000        
Impairment of equity method investments                     $ 0 $ 0 0      
Disposed of by Sale | RCM6, LLC (RCM6)                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent 24.95% 24.95%                            
Net sales proceeds, including proceeds received by third parties $ 1,800,000                              
Tinuum Group                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent     42.50%       42.50%       42.50% 42.50%        
Preferred return to third party unitholders                     15.00%          
Preferred unitholder, redemption period                     10 years          
Preferred unitholder, redemption notice period                     180 days          
Voting interest     50.00%               50.00%          
Earnings from equity method investments                     $ 41,650,000 $ 8,651,000 43,584,000      
Equity method investments     $ 0       $ 0       0 0 0   $ 0  
Losses related to VIEs, attributable to noncontrolling interest                     27,234,000 10,675,000 11,023,000      
Tinuum Group | Cash distributions                                
Schedule of Equity Method Investments [Line Items]                                
Earnings from equity method investments                     (41,650,000) (8,651,000) (43,584,000)      
Equity method investments     41,650,000       8,651,000       41,650,000 8,651,000 43,584,000   0  
Tinuum Group | Memo Account: Cash distributions and equity loss in (excess) of investment balance                                
Schedule of Equity Method Investments [Line Items]                                
Earnings from equity method investments                     0 0 0      
Equity method investments     $ 9,894,000       (3,263,000)       $ 9,894,000 (3,263,000) (29,877,000)   $ (12,906,000)  
NexGen Refined Coal, LLC (NexGen)                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent     42.50%               42.50%          
GSFS Investments I Corp. (GSFS)                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent     15.00%               15.00%          
Tinuum Services                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent     50.00%               50.00%         50.00%
Earnings from equity method investments                     $ 4,491,000 4,838,000 3,625,000      
Equity method investments     $ 3,959,000       3,968,000       3,959,000 3,968,000        
Losses related to VIEs, attributable to noncontrolling interest                     $ 198,464,000 213,746,000 132,237,000      
RCM6, LLC (RCM6)                                
Schedule of Equity Method Investments [Line Items]                                
Ownership interest, percent     24.95%               24.95%     24.95%    
Earnings from equity method investments   $ (557,000)                 $ (557,000) (4,568,000) (4,497,000)      
Equity method investments     $ 0       13,264,000       0 13,264,000        
Purchase, contributions and advances to equity method investees                     200,000 2,400,000 4,200,000      
Purchase of membership interest, note payable outstanding     14,200,000       $ 14,200,000       14,200,000 14,200,000        
Amount by which investment exceeded proportionate share of investee's net assets     $ 11,900,000               11,900,000          
Earnings (loss) from equity method investment for depreciation and amortization related to investment basis difference                     300,000 $ 1,900,000 $ 1,700,000      
RCM6, LLC (RCM6) | Refined Coal                                
Schedule of Equity Method Investments [Line Items]                                
Gain on sale of equity method investment                     $ 2,100,000