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Employee Benefit Plans - Additional Information (Detail)
12 Months Ended
Sep. 01, 2015
Jun. 23, 2015
USD ($)
shares
May. 28, 2015
USD ($)
shares
Dec. 31, 2015
USD ($)
plan
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
May. 31, 2014
shares
Dec. 31, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, shares authorized       40,000,000 40,000,000      
Treasury stock, shares       1,434,389 441,406      
Number of active plans | plan       2        
Share-based compensation expense | $       $ 1,373,000 $ 931,000 $ 932,000    
Granted (in shares)       0 0 0    
Options outstanding (in shares)       0 4,000 10,000   20,000
Options, outstanding, intrinsic value | $       $ 0        
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)       437,946 413,288 371,502   423,264
Options, vested in period, fair value | $       $ 157,000 $ 227,000 $ 72,000    
Period for recognition of unrecognized compensation cost       2 years 2 months 12 days        
Unrecognized compensation costs, other than options | $       $ 1,258,000        
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)       128,500 278,900 569,296   933,887
Options, vested in period, fair value | $       $ 1,038,000 $ 552,000 $ 2,182,000    
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation costs, options | $       $ 87,000        
Period for recognition of unrecognized compensation cost       8 months 12 days        
Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense | $       $ 482,000 0 0    
Award vesting period       48 months        
Employee Stock Purchase Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares registered for employee purchase             300,000  
The 2014 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock authorized but not granted (in shares)       1,500,000        
Granted (in shares)       100,446        
The 2014 Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years        
The Director's Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested       36,189        
Restricted stock authorized but not granted (in shares)       300,000        
Grants in period (in shares)       36,189        
The 2004 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)       128,500        
Award vesting period       5 years        
Restricted stock authorized but not granted (in shares)       2,680,000        
Weighted average remaining contractual term       10 years        
The 2004 Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant       0        
Authorized shares remaining for issuance       337,500        
The 2004 Plan [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)       128,500        
Number of shares available for grant       0        
The 2004 Plan [Member] | Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options outstanding (in shares)       0        
Directors Option Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)       0        
Award vesting period       184 days        
Restricted stock authorized but not granted (in shares)       180,000        
Weighted average remaining contractual term       10 years        
Options outstanding (in shares)       0        
Directors Option Plan [Member] | Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for grant       0        
Directors Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock authorized but not granted (in shares)       175,000        
Number of shares available for grant       0        
Directors Stock Plan [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       3 years        
Annual Cash Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Targeted bonus award expense | $       $ 4,964,000 $ 3,166,000 $ 3,111,000    
Maximum [Member] | Directors Option Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restricted stock authorized but not granted (in shares)       2,000        
Chief Financial Officer [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vested     13,585          
Pro-rata grant of restricted stock | $     $ 231,000          
Vice President [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)   29,941            
Consulting agreement, period 18 months              
Accelerated compensation cost | $   $ 195,000            
Vice President [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of nonvested shares (in shares)   16,500            
Selling, General and Administrative Expenses [Member] | Chief Financial Officer [Member] | Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Pro-rata grant of restricted stock | $     $ 231,000          
Period to Grant Date [Member] | Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       12 months        
Remaining Award Vesting Period [Member] | Short-term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period       36 months