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Fair Value Measurements - Hierarchy of Fair Value, Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Total assets | $ 156,215 | $ 316,249
Money market funds |  |
Assets: |  |
Total assets | 742 | 742
Commodity derivative instruments |  |
Assets: |  |
Total assets | 155,473 | 315,507
Level 1 |  |
Assets: |  |
Total assets | 742 | 742
Level 1 | Money market funds |  |
Assets: |  |
Total assets | 742 | 742
Level 1 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 0 | 0
Level 2 |  |
Assets: |  |
Total assets | 155,473 | 315,507
Level 2 | Money market funds |  |
Assets: |  |
Total assets | 0 | 0
Level 2 | Commodity derivative instruments |  |
Assets: |  |
Total assets | 155,473 | 315,507
Level 3 |  |
Assets: |  |
Total assets | 0 | 0
Level 3 | Money market funds |  |
Assets: |  |
Total assets | 0 | 0
Level 3 | Commodity derivative instruments |  |
Assets: |  |
Total assets | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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