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Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended |  |
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Feb. 28, 2014 | Oct. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |
Notional amount |  |  | $ 8,937 invest_DerivativeNotionalAmount | $ 11,690 invest_DerivativeNotionalAmount
Interest Rate Swaps Agreement |  |  |  |
Derivative [Line Items] |  |  |  |
Interest rate swap agreement, term | 15 years | 10 years |  |
Notional amount | $ 4,370 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 3,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Details
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