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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 | Jun. 30, 2016 USD ($) bbl MMBTU | Dec. 31, 2015 USD ($) bbl MMBTU
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 912 | 1,184
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 627 | 45
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 3,176 | $ 12,650
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (3,023) | $ (352)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 0 | 760
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 3,325 | 0
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 0 | $ 560
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,946) | $ 0
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 627 | 45
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 912 | 1,184
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 3,128 | $ 354
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (3,044) | $ (12,454)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 3,325 | 0
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 0 | 760
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 2,031 | $ 0
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ 0 | $ (549)

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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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