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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Operating Loss Carryforwards | $ 9,300,000 |  |
Unrecognized Tax Benefits | $ 0 |  |
Federal statutory rate | 21.00% | 21.00% | 35.00%
Annual effective income tax rate, percentage | 19.00% | 19.00% | 47.00%
Net deferred tax asset | $ 16,862,000 | $ 23,566,000 |
Alternative minimum tax credit carryforward | 216,000 | 216,000 |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 0 | $ 346,000 | $ (16,709,000)

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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