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Derivatives - Reconciliation of Liabilities Classified as Level 3 (Detail) (Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Mark To Market On Series F Agreement [Member]
Derivative [Line Items] |  |  |
Ending Liability Balance | $ (537) | $ (826) |
Mark-to-Market of the Series F Agreement |  |  | 289
Ending Liability Balance | $ (537) | $ (826) |

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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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