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Investment in Laramie Energy Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |
Payments to Acquire Equity Method Investments | $ 0 | $ 55,000,000 |  |
Depreciation, depletion, and amortization | 11,260,000 | 5,095,000 |  |
Unrealized loss (gain) on derivative contracts | $ (1,488,000) | 1,609,000 |  |
Laramie Energy Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership of Laramie Energy, LLC | 42.30% |  |  |
Payments to Acquire Equity Method Investments |  |  | $ 55,000,000 | $ 27,500,000
Line credit maximum borrowing amount | $ 400,000,000 |  |  |
Asset borrowing base currently at | 210,000,000 |  |  |
Balance outstanding on the revolving credit facility | 121,000,000 |  |  |
Depreciation, depletion, and amortization | 13,300,000 | 7,600,000 |  |
Unrealized loss (gain) on derivative contracts | (24,200,000) | $ (5,900,000) |  |
Amount of equity in underlying assets exceeding carrying value | $ 66,500,000 |  | $ 67,800,000 |
Amortization of natural gas and oil properties | 15 years |  |  |

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