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Stock-Based Employee Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
Installment
$ / shares
shares
Sep. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation | $ $ 1.2 $ 1.3
Number of installments of restricted shares | Installment 3  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense of restricted stock | $ $ 2.6 $ 2.1
2005 Executive Incentive Compensation Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock shares granted | shares 583,882  
Fair market value of restricted shares granted | $ / shares $ 3.518  
Non-Employee Directors Restricted Stock Plan [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock shares granted | shares 53,274  
Fair market value of restricted shares granted | $ / shares $ 4.505