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Amount of Outstanding Debt and Notional Amount on Interest Rate Swap Contract (Detail) (Interest Rate Swap, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Interest Rate Swap |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Outstanding Variable Rate Debt | $ 99,400 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 51,550 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 46,000 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Notional Amount on Interest Rate Swap |  | $ 36,750 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 44,250 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 The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
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