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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred tax adjustment related to reduction in U.S. federal statutory income tax rate	$ 0	$ 3,009,000	$ 0
Unrecognized tax benefit	0	0
Income tax matters accrued interest or penalties	0	0
Expense relate to interest and penalties	$ 0	$ 0	$ 0

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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