v3.8.0.1

Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Jan. 02, 2016 USD ($) | Apr. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) Well | Dec. 31, 2015 USD ($) Well
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of exploratory wells capitalized | Well |  |  |  |  | 0 | 0
Capitalized interest cost |  |  |  | $ 0 |  |
Depreciation depletion and amortization for oil & gas |  |  |  | 70,300,000 | $ 78,700,000 | $ 108,800,000
Impairment of oil and gas properties and equipment |  |  |  | 0 | 0 | 220,197,000
Depreciation expense for other property and equipment |  |  |  | $ 237,000 | 343,000 | 563,000
Tax benefit |  |  |  | 50.00% |  |
Uncertain tax positions |  |  |  | $ 0 | 0 |
Valuation allowance on deferred tax assets after accounting for change in corporate federal income tax rate under tax cuts and job act |  |  |  | 500,000 |  |
Prepayment under the agreement |  |  | $ 5,000,000 |  |  |
Utilization of prepayment related to hydraulic fracturing services provided |  |  |  | 700,000 |  |
Prepaid expenses and other current assets |  |  |  | $ 5,486,000 | 2,834,000 |
Number of days in which payment is to be made |  |  |  | 30 days |  |
Exploration expenses |  |  |  | $ 3,657,000 | $ 3,923,000 | $ 4,439,000
Number of business segment | Segment |  |  |  | 1 |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase in accumulated earnings |  | $ 1,700,000 |  |  |  |
Customer Concentration Risk [Member] | DCP Midstream, LLC [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Sales to customers |  |  |  | 47.00% | 46.00% | 36.00%
Customer Concentration Risk [Member] | JP Energy Permian, LLC [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Sales to customers |  |  |  | 52.00% | 54.00% | 63.00%
Drilling Contracts [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Exploration expenses |  |  |  |  | $ 2,200,000 |
Subsequent Event [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Prepayment additional used amount | $ 500,000 |  |  |  |  |
Unused Prepaid Balance [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  | $ 4,300,000 |  |
Unused Prepaid Balance [Member] | Subsequent Event [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Proceeds from prepayment under the agreement | $ 3,800,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of furniture, fixtures and equipment |  |  |  | 3 years |  |
Minimum [Member] | Oil and Gas [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of days in which payment is to be made |  |  |  | 30 days |  |
Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives of furniture, fixtures and equipment |  |  |  | 15 years |  |
Maximum [Member] | Oil and Gas [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of days in which payment is to be made |  |  |  | 60 days |  |
Proved Property Impairment [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of oil and gas properties and equipment |  |  |  | $ 0 | 0 | $ 214,700,000
Unproved Property Impairment [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of oil and gas properties and equipment |  |  |  | $ 0 | $ 0 | $ 5,500,000

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=96866604&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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