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Equity Method Investments - Results of Operations and Summary of Distributions (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
Operating, selling, general and administrative expenses $ 25,555,000     $ 22,296,000     $ 65,516,000 $ 85,748,000    
Net income (loss) 24,253,000 $ 16,590,000 $ 13,737,000 4,975,000 $ (23,814,000) $ (1,893,000) 54,580,000 (20,732,000)    
ADES equity earnings 22,195,000     9,518,000     61,944,000 25,959,000    
Equity method investments 2,884,000           2,884,000   $ 7,692,000  
Distributions from equity method investees, return on investment             22,044,000 42,228,000    
Distributions from equity method investees in excess of investment basis             44,707,000 0    
Tinuum Group, LLC                    
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
ADES equity earnings 19,975,000     7,260,000     55,462,000 20,462,000    
Equity method investments 0 $ 0 $ 0 17,516,000 $ 18,118,000 $ 24,954,000 0 17,516,000 3,387,000 $ 32,280,000
Distributions from equity method investees, return on investment             14,142,000 35,226,000    
Distributions from equity method investees in excess of investment basis             44,707,000 0    
Tinuum Services, LLC                    
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
ADES equity earnings 2,223,000     2,257,000     6,485,000 5,498,000    
Equity method investments 2,824,000           2,824,000   4,242,000  
Distributions from equity method investees, return on investment             7,902,000 7,002,000    
(Loss) earnings from other                    
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
ADES equity earnings (3,000)     1,000     (3,000) (1,000)    
Equity method investments 60,000           60,000   $ 63,000  
Equity Method Investment | Tinuum Group, LLC                    
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
Gross profit (loss) (3,226,000)     101,000     8,269,000 11,979,000    
Operating, selling, general and administrative expenses 12,077,000     13,781,000     38,308,000 38,476,000    
Loss from operations (15,303,000)     (13,680,000)     (30,039,000) (26,497,000)    
Other income (expenses), net 6,027,000     5,739,000     10,030,000 11,526,000    
Loss attributable to noncontrolling interest 34,551,000     25,023,000     99,167,000 63,117,000    
Net income (loss) 25,275,000     17,082,000     79,158,000 48,146,000    
Equity Method Investment | Tinuum Services, LLC                    
Equity Method Investment, Financial Statement, Reported Amounts [Abstract]                    
Gross profit (loss) (20,389,000)     (22,764,000)     (61,552,000) (65,441,000)    
Operating, selling, general and administrative expenses 42,346,000     42,435,000     144,068,000 131,703,000    
Loss from operations (62,735,000)     (65,199,000)     (205,620,000) (197,144,000)    
Other income (expenses), net 3,204,000     (363,000)     2,810,000 (978,000)    
Loss attributable to noncontrolling interest 63,977,000     70,075,000     215,779,000 209,118,000    
Net income (loss) $ 4,446,000     $ 4,513,000     $ 12,969,000 $ 10,996,000