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Summary of Significant Accounting Policies - Schedule of Fair Value Impairments, Average Prices of Oil and Gas Properties And Applicable Discount Rates (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) $ / bbl $ / Mcf | Sep. 30, 2015 USD ($) $ / bbl $ / Mcf | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties | $ 2,561 | $ 113 | $ 1,742 | $ 22,718 | $ 254,246 | $ 544,714 | $ 1,984 | $ 403 | $ 27,134 | $ 801,347 | $ 60,268
Oil Properties |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  | 3,030 | 330,257 |  |  |  | 3,030 |
Impairment of oil and gas properties |  |  |  |  | $ 16,036 | $ 405,308 |  |  |  |  |
Management's Oil Price Outlook | $ / bbl |  |  |  |  | 73.48 | 73.70 |  |  |  |  |
Management's Gas Price Outlook | $ / Mcf |  |  |  |  |  | 4.04 |  |  |  |  |
Oil Properties | Minimum |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual Discount Rate |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Oil Properties | Maximum |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual Discount Rate |  |  |  |  | 20.00% | 20.00% |  |  |  |  |
Natural Gas Properties |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  | $ 123,926 | $ 61,625 |  |  |  | $ 123,926 |
Impairment of oil and gas properties |  |  |  |  | $ 238,210 | $ 139,406 |  |  |  |  |
Management's Oil Price Outlook | $ / bbl |  |  |  |  | 70.76 | 75.91 |  |  |  |  |
Management's Gas Price Outlook | $ / Mcf |  |  |  |  | 3.74 | 3.91 |  |  |  |  |
Natural Gas Properties | Minimum |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual Discount Rate |  |  |  |  | 10.00% | 10.00% |  |  |  |  |
Natural Gas Properties | Maximum |  |  |  |  |  |  |  |  |  |  |
Fair Value And Impairments Oil And Gas Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual Discount Rate |  |  |  |  | 20.00% | 20.00% |  |  |  |  |

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