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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Detriment from a valuation allowance recorded against deferred tax asset, percentage | $ 0.19 |  |
Detriment from the recording of a valuation allowance, percentage | (19.00%) | 348.00% |
Oil and gas percentage depletion carryforwards | $ 9,200,000 |  |
AMT credits | 5,900,000 | $ 3,620,000 |
Valuation allowance | 73,405,000 | 97,068,000 |
Decrease in valuation allowance | 23,663,000 |  |
Unrecognized tax benefit | 2,499,000 | 0 | $ 0
Recognized interest accrued related to unrecognized tax benefits | 0 | 0 | $ 0
Accrued interest | 0 | $ 0 |
Credo |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Oil and gas percentage depletion carryforwards | 9,200,000 |  |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards | $ 7,500,000 |  |
Expiration date of operating loss carry forwards | Dec. 31, 2031 |  |
Domestic Tax Authority | Credo |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards | $ 7,500,000 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards | 64,200,000 |  |
State and Local Jurisdiction | Credo |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards | $ 2,400,000 |  |
Minimum | State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Expiration date of operating loss carry forwards | Dec. 31, 2017 |  |
Maximum | State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Expiration date of operating loss carry forwards | Dec. 31, 2036 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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