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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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