Description of Business, Basis of Consolidation, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	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