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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
Income before income taxes | $ 2,540,000 | $ 4,198,000 |  |
Income tax provision | $ 915,000 | $ 1,268,000 |  |
Effective tax rate | 36.00% | 30.20% |  |
Expected effective tax rate |  |  |  | 25.90%
Latest Tax Year |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss and business tax credit carry forwards expiration date | At various dates through December 2035. |  |  |
Scenario, Forecast |  |  |  |
Income Taxes [Line Items] |  |  |  |
Expected effective tax rate |  |  | 26.50% |
Available to Reduce Future Federal Income Taxes |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carry forwards | $ 46,984,000 |  |  |
Business tax credit carry forwards | $ 1,920,000 |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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