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Investment in Laramie Energy - Additional Information (Detail) - USD ($) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | May 29, 2015 | Mar. 09, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 01, 2016 | Feb. 29, 2016 | Jul. 30, 2015 | May 28, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Laramie Energy, LLC |  |  |  | $ 55,000,000 | $ 27,529,000 | $ 12,000 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  |  | 31,617,000 | 19,918,000 | 14,897,000 |  |  |  |
Unrealized loss (gain) on derivative contracts |  |  |  | $ 15,479,000 | (10,896,000) | 1,015,000 |  |  |  |
Laramie Energy Company |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership of Laramie Energy, LLC | 32.40% | 34.00% |  | 42.30% |  |  | 42.30% | 32.40% | 34.00% | 33.34%
Line credit maximum borrowing amount |  |  |  | $ 400,000,000 |  |  |  |  |  |
Asset borrowing base currently at |  |  |  | 170,000,000 |  |  |  |  |  |
Balance outstanding on the revolving credit facility |  |  |  | 117,500,000 | 77,300,000 |  |  |  |  |
Investment in Laramie Energy, LLC |  | $ 13,800,000 | $ 13,800,000 |  |  |  |  |  |  |
Other than temporary impairment charge |  |  |  | 0 | (41,081,000) | 0 |  |  |  |
Aggregate cash purchase price |  |  |  | 55,000,000 | 27,529,000 | 12,000 |  |  |  |
Depreciation, depletion, amortization and accretion |  |  |  | 42,700,000 | 24,600,000 | 32,800,000 |  |  |  |
Unrealized loss (gain) on derivative contracts |  |  |  | (34,500,000) | (16,600,000) | $ 9,800,000 |  |  |  |
Impairment of unproved properties |  |  |  |  | 12,300,000 |  |  |  |  |
Amount of equity in underlying assets exceeding carrying value |  |  |  | $ 67,800,000 | $ 55,400,000 |  |  |  |  |
Amortization of natural gas and oil properties |  |  |  | 15 years |  |  |  |  |  |
Unaffiliated Third Party | Laramie Energy Company |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Laramie Energy, LLC | $ 19,000,000 |  |  |  |  |  |  |  |  |
Piceance Basin | Laramie Energy Company |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in Laramie Energy, LLC |  |  |  | $ 157,500,000 |  |  |  |  |  |

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- Definition Amount of increase (decrease) in assets of equity method investment related to capitalized drilling costs obligation paid. + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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