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Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ (58) | $ 989

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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