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Retirement Plans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
OptionPlan
Investment_Options
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Defined contribution retirement plan, Company match on first 6% of employee contributions 50.00%    
Defined contribution retirement plan, employee contributions for which Company will match at 50% 6.00%    
Defined contribution retirement plan, number of investment options offered 25    
Non-qualified retirement savings plan, Company match percentage on first $10,000 of employee contributions 50.00%    
Non-qualified retirement savings plan, Officer contributions for which Company will match at 50% $ 10,000    
Non-qualified retirement savings plan, Select employee contributions for which Company will match at 50% 5,000    
Non-qualified retirement savings plan target benefit amount 35% of final base pay after a 35-year career with the Company or 1% of final base pay per year of service    
Non-qualified retirement savings plan actuarial yearly asset growth percentage assumption 8.00%    
Number of noncontributory defined benefit plans 2    
Accrued pension liability 1,200,000 2,600,000  
Unrecognized actuarial loss, net of tax 1,200,000 2,200,000  
Projected and accumulated benefit obligation 5,800,000 6,700,000  
Fair value of plan assets 4,600,000 4,100,000  
Net periodic benefit cost 400,000 400,000 300,000
Weighted average discount rates used to measure projected benefit obligation 4.40% 3.52%  
Expected weighted average long term rate of return on plan assets 7.50% 7.50%  
Total expense for all retirement plans $ 1,800,000 $ 1,700,000 $ 1,300,000