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Stock-Based Compensation - Restricted Stock - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 15, 2015
Nov. 30, 2014
Sep. 11, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares received         222,625 654,000 467,500
Expected weighted average period         1 year 8 months 12 days    
Rate of forfeiture of shares         3.00% 3.00% 3.00%
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation expense related to restricted stock awards         $ 4.0    
Expected weighted average period         1 year 10 months 24 days    
Restricted Stock [Member] | Non Employee Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares received         10,000    
Restricted stock, vesting period         Four quarters    
Restricted Stock [Member] | Non Employee Director [Member] | September 2014 Award Date [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares received       10,000      
Restricted stock, vesting percentage     25.00%        
Restricted stock, vesting date         Nov. 30, 2014    
Restricted stock, vesting period         Three quarters    
Restricted Stock [Member] | Non Employee Director [Member] | May 2015 Award Date [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted shares received   10,000          
Restricted stock, vesting percentage 25.00%            
Restricted stock, vesting date         May 31, 2015    
Restricted stock, vesting period         Three quarters