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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Taxes And Tax Related [Line Items]
Alternative minimum tax credits	$ 6,612,000	$ 5,319,000
Allowed tax credit operating losses carry forward	586,000	$ 575,000
Tax paid in settlement of 2014 federal income tax return	75,000
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] | 2017 through 2026 [Member]
Income Taxes And Tax Related [Line Items]
Allowed tax credit operating losses carry forward	$ 89,000

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Income Taxes And Tax Related [Line Items]

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 25
-Paragraph 20
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6504908

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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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