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Derivative Financial Instruments (Detail) (Interest Rate Swap, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Investment
Interest Rate Swap
Derivative [Line Items]
Number of Instruments	4
Notional Amount	$ 41,095
Fair Value	$ (641)
Valuation Technique	Level 2 - Market Approach

X

- Definition

Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

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- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

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-Publisher FASB

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