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Description of Business, Basis of Consolidation, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Category
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]        
Number of reportable business category | Category   1    
Advertising expense   $ 3,020,000 $ 2,271,000 $ 3,535,000
Inventory reserve allowance   3,137,000 3,594,000  
Accrued program costs   39,054,000 42,930,000  
Impairment loss of long-lived assets   0 0  
Unrecognized tax benefits   $ 2,118,000 $ 1,893,000 $ 2,007,000
Stock options excluded from computation of diluted earning per share | shares   0 0 0
Reduction in share based compensation expense   $ 177,000 $ 118,000 $ 144,000
Subsequent Event        
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]        
Gross revenues $ 3,000,000      
Cumulative effect adjustment, increase retained earning net of taxes $ 2,370,000      
Restricted Stock        
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]        
Forfeited percentage of stock   15.10%    
Weighted average grant-date fair values of restricted stock grants | $ / shares   $ 16.24 $ 15.22 $ 12.68
Performance Based Restricted Shares        
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]        
Forfeited percentage of stock   15.10%    
Weighted average grant-date fair values of restricted stock grants | $ / shares   $ 15.43 $ 14.39  
Incentive Stock Options        
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]        
Forfeited percentage of stock   4.50%    
Option shares granted | shares   0 0 0