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Retirement Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution retirement plan voluntary contributions $ 18,000    
Retirement benefit obligations   $ 13,796,000 $ 11,678,000
Retirement benefit obligations discount rate 3.96% 3.65%  
Expected actuarial losses included in accumulated other comprehensive loss in net periodic benefit cost $ 91,000    
Accumulated benefit obligation 0 $ 13,800,000  
Accumulated Other comprehensive income 0 623,000  
Former Executives      
Defined Benefit Plan Disclosure [Line Items]      
Retirement benefit obligations 6,500,000 $ 6,900,000  
Employees 50 years or over      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution retirement plan voluntary contributions $ 24,000