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Derivative Financial Instruments - Notional Amounts and Estimated Fair Values of Outstanding Derivative Positions (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities, Estimated Fair Value | $ 1,029 | $ 1,801
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Estimated Fair Value | 2,211 | 3,521
Oil [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Units | Barrels | Barrels
Derivative assets, Notional Amount | 335 | 738
Derivative assets, Estimated Fair Value | 827 | 2,568
Derivative liabilities, Notional Amount | (335) | (738)
Derivative liabilities, Estimated Fair Value | (378) | (1,591)
Natural Gas [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Units | MMBTUs | MMBTUs
Derivative assets, Notional Amount | 5,128 | 4,431
Derivative assets, Estimated Fair Value | 1,384 | 953
Derivative liabilities, Notional Amount | (5,128) | (4,431)
Derivative liabilities, Estimated Fair Value | $ (651) | $ (210)

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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