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Executive Benefit Agreements and Employee Savings Plans - Life Insurance Policies (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Executive Benefit Agreements and Employee Savings Plans [Line Items]    
Total face value of life insurance policies $ 21,242 $ 21,522
Cash surrender values of life insurance policies 5,439 4,961
Loans on cash surrender values   (1,890)
Net cash surrender values $ 5,439 $ 3,071