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Employee Benefit Plans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation Related Costs [Abstract]      
Severance costs $ 881,000 $ 961,000 $ 997,200
Deferred compensation agreements expenses 561,000 494,000 473,000
Maximum percentage of salary defer by individual under deferred compensation plan 75.00%    
Maximum percentage of bonus defer by individual under deferred compensation plan 100.00%    
Deferred compensation plan, discretionary payments 0 0 0
Amounts paid under deferred compensation and salary continuation agreements 1,500,000    
Employer contribution percentage to 401(k) plan 3.00%    
Employer contribution in profit-sharing plan $ 2,700,000 $ 2,400,000 $ 2,700,000