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Executive Benefits Agreements and Employees Savings Plans - Life Insurance Policies (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compensation Related Costs [Abstract]    
Total face value of life insurance policies $ 26,242us-gaap_LifeInsuranceCorporateOrBankOwnedAmount $ 26,242us-gaap_LifeInsuranceCorporateOrBankOwnedAmount
Total cash surrender values of life insurance policies $ 6,936us-gaap_CashSurrenderValueOfLifeInsurance $ 6,184us-gaap_CashSurrenderValueOfLifeInsurance