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Description of Business, Basis of Consolidation, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Segment $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of reportable business segments | Segment | 1 |  |
Advertising expense | $ 2,271,000 | $ 3,535,000 | $ 4,322,000
Inventory reserve allowance | 3,594,000 | 4,020,000 |
Accrued program costs | 42,930,000 | 44,371,000 |
Impairment loss of long-lived assets | 0 | 0 |
Elimination of Assets and Accumulated depreciation | 16,652,000 | 549,000 | 5,358,000
Unrecognized tax benefits | $ 1,893,000 | $ 2,007,000 | $ 1,958,000
Stock options excluded from computation of diluted earning per share | shares | 0 | 0 | 1,616
Reduction in share based compensation expense | $ 118,000 | $ 144,000 | $ 303,000
Accounting Standards Update 2015-17 |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Reclassification of deferred tax assets from current assets to noncurrent assets |  | $ 20,699,000 |
Common Stock Grants |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Forfeited percentage of stock | 16.60% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares | $ 15.22 | $ 12.68 | $ 14.81
Performance Based Restricted Shares |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Forfeited percentage of stock | 16.60% |  |
Weighted average grant-date fair values of restricted stock grants | $ / shares | $ 14.39 | $ 11.38 |
Incentive Stock Options |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Forfeited percentage of stock | 7.50% |  |
Weighted average grant-date fair values of options in period | $ / shares |  |  | $ 5.27
Option shares granted | shares | 0 | 0 |
Building | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 10 years |  |
Building | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 30 years |  |
Machinery and equipment | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 3 years |  |
Machinery and equipment | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 15 years |  |
Office furniture, fixtures and equipment | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 3 years |  |
Office furniture, fixtures and equipment | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 10 years |  |
Automotive equipment | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 3 years |  |
Automotive equipment | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 6 years |  |
Construction in progress | Minimum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 3 years |  |
Construction in progress | Maximum |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, Plant and Equipment Useful Life | 15 years |  |
Net Deferred Tax Liability |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Prior period reclassification adjustment |  | $ (12,598,000) |
Income Tax Payable |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |  |
Prior period reclassification adjustment |  | $ 12,598,000 |

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