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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) bbl in Thousands, MMBTU in Thousands, $ in Thousands | Mar. 31, 2017 USD ($) MMBTU bbl | Dec. 31, 2016 USD ($) MMBTU bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 619 | 227
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 402 | 944
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 889 | $ 206
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,180) | $ (4,400)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 976 | 0
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 1,555 | 1,299
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 73 | $ 0
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (499) | $ (1,357)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 427 | 944
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 594 | 227
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,234 | $ 4,580
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (788) | $ (206)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 1,555 | 1,299
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 976 | 0
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 537 | $ 1,393
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (70) | $ 0

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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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