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Investment in Laramie Energy, LLC - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2018 | Feb. 28, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Mar. 04, 2019 | Mar. 01, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Depreciation, depletion, and amortization |  |  |  | $ 86,121,000 | $ 52,642,000 | $ 45,989,000 |  |  |
Unrealized gain (loss) on derivative contracts |  |  |  | $ (9,350,000) | (2,122,000) | 989,000 |  |  |
Laramie Energy Company |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Ownership of Laramie Energy, LLC | 46.00% | 39.10% | 46.00% | 46.00% |  |  |  |  | 42.30%
Impairment loss |  |  |  | $ 355,200,000 |  |  |  |  |
Equity method investments, fair value |  |  |  |  |  |  | $ 51,800,000 |  |
Equity method investment, aggregate cost |  |  |  |  |  |  | 133,300,000 |  |
Impairment charge |  |  |  | 81,515,000 | 0 | 0 |  |  |
Depreciation, depletion, and amortization |  |  |  | 82,600,000 | 66,600,000 | 50,300,000 |  |  |
Unrealized gain (loss) on derivative contracts |  |  |  | 4,300,000 | (4,100,000) | $ 46,200,000 |  |  |
Amount of equity in underlying assets exceeding carrying value |  |  | $ 0 | 0 |  |  | $ 161,800,000 |  |
Laramie Energy Company |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Impairment loss |  |  | 355,200,000 |  |  |  |  |  |
Disposal group, property, plant and equipment |  |  |  |  |  |  |  | $ 17,500,000 |
Unaffiliated Third Party | Laramie Energy Company |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments, fair value |  | $ 28,100,000 |  |  |  |  |  |  |
Investment in Laramie Energy, LLC |  | $ 20,000,000.0 |  |  |  |  |  |  |
Shares issued (in shares) |  | 70,227 |  |  |  |  |  |  |
Additional payments to acquire equity method investments |  | $ 3,500,000 |  |  |  |  |  |  |
Revolving Credit Facility | Laramie Energy Company |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Line credit maximum borrowing amount |  |  | 400,000,000 | 400,000,000 |  |  |  |  |
Current borrowing capacity |  |  | 220,000,000 | 220,000,000 |  |  |  |  |
Balance outstanding on the revolving credit facility |  |  | $ 201,200,000 | $ 201,200,000 | $ 210,800,000 |  |  |  |
Capital Unit, Class A | Laramie Energy Company |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased during period (in shares) | 138,795 |  |  |  |  |  |  |  |
Stock repurchased during period | $ 14,800,000 |  |  |  |  |  |  |  |

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