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Equity Method Investments - Rollforward of CCS Investment (Details) - USD ($) | 3 Months Ended
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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) |  |  |

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