Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.7.0.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
May 02, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, issued 20,943,000     20,893,000
Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
weighted-average period 2 years      
Unrecognized compensation expense $ 1,000,000      
Stock awards vesting periods 3 years      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
weighted-average period 2 years 9 months 18 days      
Unrecognized compensation expense $ 1,800,000      
Restricted shares vested, fair value   $ 200,000    
Maximum | Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares vested, fair value $ 100,000 $ 100,000    
2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, issued 1,100,000      
2013 Plan | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, issued     1,600,000  
2003 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, issued 0      
Options outstanding, intrinsic value $ 0      
Unrecognized compensation expense $ 100,000      
2003 Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
weighted-average period 1 year