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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes And Tax Related [Line Items] |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax benefit |  |  |  |  | $ 20,204,000 |
Alternative minimum tax credits |  |  |  |  | 9,919,000 | $ 6,612,000
Expected credits against regular tax and refunds of previously paid taxes |  |  |  |  | $ 9,918,000 |
Number of years in which tax refund is expected to be received |  |  |  |  | 4 years |
Allowed tax credit operating losses carry forward |  |  |  |  | $ 528,000 | 586,000
Tax paid in settlement of 2014 federal income tax return |  |  |  |  |  | $ 75,000
Scenario, Forecast [Member] |  |  |  |  |  |
Income Taxes And Tax Related [Line Items] |  |  |  |  |  |
Percentage of AMT credit refundable | 100.00% | 50.00% | 50.00% | 50.00% |  |
Texas Franchise Tax [Member] |  |  |  |  |  |
Income Taxes And Tax Related [Line Items] |  |  |  |  |  |
Tax credit operating carry forward losses allowed after the period |  |  |  |  | $ 0 |
Tax credit operating carry forward losses allowed after the period, Description |  |  |  |  | No credit may be carried forward past 2026. |
Texas Franchise Tax [Member] | 2018 through 2026 [Member] |  |  |  |  |  |
Income Taxes And Tax Related [Line Items] |  |  |  |  |  |
Allowed tax credit operating losses carry forward |  |  |  |  | $ 89,000 |

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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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