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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
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding Variable Rate Debt	$ 99,400us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 51,550us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 46,000us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Notional Amount on Interest Rate Swap		$ 36,750invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 44,250invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

X

- 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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X

- Details

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X

- 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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