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Derivative Activities - Fair Value of Derivative Contracts, by Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value | $ 75,075 |  | $ 152,114 |
Liabilities Carrying Value | (16,308) |  | (12,963) |
Net Carrying Value | 58,767 |  | 139,151 |
Assets Carrying Value | 71,425 |  | 15,086 |
Liabilities Carrying Value | (2,673) |  | (8,904) |
Net Carrying Value | 68,752 |  | 6,182 |
Swap |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value | 11,028 | [1] | 22,236 | [1]
Liabilities Carrying Value | (5,952) | [1] | (3,242) | [1]
Net Carrying Value | 5,076 | [1] | 18,994 | [1]
Collars |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value | 64,047 | [1] | 129,878 | [1]
Liabilities Carrying Value | (10,356) | [1] | (9,721) | [1]
Net Carrying Value | 53,691 | [1] | 120,157 | [1]
Assets Carrying Value | 33,112 | [1] | 857 | [1]
Liabilities Carrying Value | (440) | [1] |  |
Net Carrying Value | 32,672 | [1] | 857 | [1]
Sold Swap |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value | 36,505 | [1] | 7,316 | [1]
Liabilities Carrying Value | (2,233) | [1] | (8,904) | [1]
Net Carrying Value | 34,272 | [1] | (1,588) | [1]
Re-purchased swaps |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value | 1,808 | [1] | 5,920 | [1]
Net Carrying Value | 1,808 | [1] | 5,920 | [1]
Basis Swap |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |
Assets Carrying Value |  |  | 993 | [1]
Net Carrying Value |  |  | $ 993 | [1]
[1] | Included in unrealized derivatives in the accompanying consolidated balance sheets. See additional discussion above regarding the discontinuance of hedge accounting.

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + 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)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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