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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Line Items] |  |
Unrecognized tax benefits | $ 0 | $ 0
State [Member] |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carry forwards | 868,000 |
Federal General Business Tax Credit Carry Forward [Member] |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carry forwards | 0 |
Alternative Minimum Tax Credit Carry Forward [Member] |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carry forwards | $ 1,600,000 |
Capital Loss Carry Forward [Member] |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carry forwards expiration date | Dec. 31, 2025 |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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