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Equity Method Investments - Rollforward of CCS Investment (Details) - USD ($)
 3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Equity Method Investments [Roll Forward]            
Beginning balance     $ 7,692,000      
Total investment balance, equity earnings (loss) and cash distributions $ 2,884,000          
Tinuum Group, LLC            
Equity Method Investments [Roll Forward]            
Beginning balance 0 $ 0 3,387,000 $ 18,118,000 $ 24,954,000 $ 32,280,000
ADES proportionate share of income from Tinuum Group 10,742,000 12,146,000 10,755,000 7,260,000 6,764,000 6,438,000
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) (12,586,000) (5,607,000)        
Cash distributions from Tinuum Group 19,975,000 19,125,000 19,749,000 7,862,000 13,600,000 13,764,000
Adjustment for current year cash distributions in excess of investment balance 21,819,000 12,586,000 5,607,000      
Total investment balance, equity earnings (loss) and cash distributions 0 0 0 17,516,000 18,118,000 24,954,000
Tinuum Group, LLC | ADES equity earnings            
Equity Method Investments [Roll Forward]            
Beginning balance 19,125,000 16,362,000 0 6,764,000 6,438,000 0
ADES proportionate share of income from Tinuum Group 10,742,000 12,146,000 10,755,000 7,260,000 6,764,000 6,438,000
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) (12,586,000) (5,607,000)        
Cash distributions from Tinuum Group 0 0 0 0 0 0
Adjustment for current year cash distributions in excess of investment balance 21,819,000 12,586,000 5,607,000      
Total investment balance, equity earnings (loss) and cash distributions 19,975,000 19,125,000 16,362,000 7,260,000 6,764,000 6,438,000
Tinuum Group, LLC | Cash distributions            
Equity Method Investments [Roll Forward]            
Beginning balance 19,125,000 19,749,000 0 13,600,000 13,764,000 0
ADES proportionate share of income from Tinuum Group 0 0 0 0 0 0
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) 0 0        
Cash distributions from Tinuum Group 19,975,000 19,125,000 19,749,000 7,862,000 13,600,000 13,764,000
Adjustment for current year cash distributions in excess of investment balance 0 0      
Total investment balance, equity earnings (loss) and cash distributions 19,975,000 19,125,000 19,749,000 $ 7,862,000 $ 13,600,000 $ 13,764,000
Tinuum Group, LLC | Memorandum Account: Cash distributions and equity loss in (excess) of investment balance            
Equity Method Investments [Roll Forward]            
Beginning balance (12,586,000) (5,607,000) 0      
ADES proportionate share of income from Tinuum Group 0 0 0      
Recovery of prior cash distributions in excess of investment balance (prior to cash distributions) (12,586,000) (5,607,000)        
Cash distributions from Tinuum Group 0 0 0      
Adjustment for current year cash distributions in excess of investment balance (21,819,000) (12,586,000) (5,607,000)      
Total investment balance, equity earnings (loss) and cash distributions $ (21,819,000) $ (12,586,000) $ (5,607,000)