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Summary of Significant Accounting Policies - Additional Information 3 (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion ratio of oil to natural gas in units of production |  |  |  |  |  |  |  |  | One barrel of oil for six thousand cubic feet of natural gas |  |
Impairment of unproved oil and natural gas properties |  | $ 76,391 |  | $ 7,753 | $ 385 | $ 5,090 | $ 23,040 | $ 40,432 | $ 84,144 | $ 68,947 | $ 500
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
Impaired oil and gas properties fair value |  |  |  |  |  |  |  |  |  |  | $ 18,000
Minimum |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment estimated useful lives |  |  |  |  |  |  |  |  | 31 years 6 months |  |
Other Properties |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impaired oil and gas properties fair value |  |  |  |  |  |  |  |  | $ 21,100 |  |
South Texas |  |  |  |  |  |  |  |  |  |  |
Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of oil and gas properties |  |  |  | 20,800 |  |  |  |  | $ 20,800 |  |
Assets held for sale, fair value |  |  |  | $ 42,500 |  |  |  |  |  |  |

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