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United States Federal Statutory Tax Rate and Effective Tax Rate (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Statutory Tax Rate and Effective Tax Rate [Line Items] |  |  |
Statutory federal tax | $ 11,965,000 | $ 8,559,000 | $ 9,688,000
State income taxes, net of federal benefit | 304,000 | 679,000 | 1,015,000
Domestic manufacturer deduction | (979,000) | (902,000) | (248,000)
FTC settlement | 0 | 1,389,000 | 0
Other permanent differences | 173,000 | (190,000) | 71,000
Research and development and jobs credits | (459,000) | (267,000) | (336,000)
Other state income tax benefits | (707,000) | (686,000) | (1,051,000)
Other | (79,000) | 0 | 0
Income Tax Expense, Total | $ 10,218,000 | $ 8,582,000 | $ 9,139,000
Effective tax rate, Statutory federal tax | 35.00% | 35.00% | 35.00%
Effective tax rate, State income taxes, net of federal benefit | 0.90% | 2.80% | 3.70%
Effective tax rate, Domestic manufacturer deduction | (2.90%) | (3.70%) | (0.90%)
Effective tax rate, FTC settlement | 0.00% | 5.70% |
Effective tax rate, Other permanent differences | 0.50% | (0.80%) | 0.30%
Effective tax rate, Research and development and jobs credits | (1.30%) | (1.10%) | (1.20%)
Effective tax rate, Other state income tax benefits | (2.10%) | (2.80%) | (3.90%)
Effective tax rate, Other | (0.20%) |  |
Effective tax rate, Total | 29.90% | 35.10% | 33.00%

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