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Stockholders' Equity - Additional Information (Detail) - USD ($)
2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2017
Jan. 28, 2016
Jan. 02, 2015
Dec. 09, 2014
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Oct. 25, 2017
Jul. 24, 2017
Apr. 26, 2017
Jul. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock authorized (shares)           75,000,000   75,000,000              
Common stock par value (usd per share)           $ 0.0001   $ 0.0001              
Preferred stock authorized (shares)           25,000,000   25,000,000              
Preferred stock par value (usd per share)           $ 0.0001   $ 0.0001              
Options outstanding (shares)           0   0   0          
Common stock outstanding (shares)           19,977,318   19,977,318   20,525,614          
Preferred stock outstanding (shares)           0   0   0          
Stock repurchase authority                           $ 10,000,000.0  
Amount spent to repurchase common stock         $ 10,000,000     $ 10,024,000              
Subsequent Event                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Dividend rate (usd per share)                       $ 0.125      
Dividends declared                       $ 2,500,000      
ESPP                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares authorized (shares)           237,056   237,056   246,039         250,000
Award required holding period               2 years              
Stock purchased during period (shares)           0 0 8,983 0            
Proceeds from issuance of common stock               $ 100,000              
2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period       36 months                      
Granted (shares)               118,467              
2012 Equity Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of shares authorized (shares)           1,021,445   1,021,445   1,246,939          
2012 Equity Plan | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)               122,629              
Time-based awards (including 2017 LTIP) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)               118,433              
January 2, 2015 | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)     254,777                        
Granted     $ 4,400,000                        
January 28, 2016 | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)   227,082                          
Granted   $ 3,800,000                          
January 2, 2017 | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares) 108,428                            
Granted $ 2,200,000                            
January 2, 2017 | Time-based awards (including 2017 LTIP) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares) 108,394                            
Granted $ 2,200,000                            
Award vesting percentage               33.00%              
Non-Employee Directors | 2012 Equity Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Annual limit to the value of awards granted                         $ 750,000    
New Employees or Promoted Employees | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)                   7,629          
New Employees or Promoted Employees | January 2, 2015 | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)                     6,123        
New Employees or Promoted Employees | January 2, 2017 | 2015 LTIP (performance-based) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)               10,039              
New Employees or Promoted Employees | January 2, 2017 | Time-based awards (including 2017 LTIP) | Restricted Stock Units                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (shares)               10,039              
Maximum | ESPP                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Offering period, maximum               6 months