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Employee Benefit Plans - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Severance costs $ 751,000 $ 866,000 $ 881,000
Deferred compensation agreements expenses $ 600,000 544,000 561,000
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 $ 2,500,000    
Employer contribution percentage to 401(k) plan 3.00%    
Employer contribution in profit-sharing plan $ 2,800,000 $ 3,100,000 $ 2,700,000
Maximum [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Maximum percentage of salary defer by individual under deferred compensation plan 75.00%