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Retirement Plans - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Defined contribution retirement plan voluntary contributions $ 17,500  
Retirement benefit obligation 5,212,000 5,752,000
Retirement Benefit Obligations Discount Rate 4.50% 3.60%
Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost 47,000  
Employees 50 years or over
   
Defined Benefit Plan Disclosure [Line Items]    
Defined contribution retirement plan voluntary contributions $ 23,000