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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

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