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Derivatives - Schedule of Change in Fair Value of Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Non-hedging interest rate derivatives, increase (decrease) in other income | $ (345)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 1,428us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ 755us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

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- Details
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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=35706170&loc=SL5624171-113959 + Details
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