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Accounting Policies - Additional Information (Detail)			3 Months Ended		9 Months Ended
	Jun. 15, 2018	May 15, 2018 $ / shares	Sep. 30, 2018 $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2017 USD ($) shares	Dec. 31, 2017 $ / shares
Schedule Of Accounting Policies [Line Items]
Stock split ratio	0.015	0.015
Common stock, par value | $ / shares		$ 0
Shares, non-dilutive | shares			0			0
Reclassifications effect on net income				$ 0		$ 0
Accounting Standards Update 2018-02 [Member]
Schedule Of Accounting Policies [Line Items]
Cumulative-effect adjustment from AOCI to increase retained earnings					$ 766,000

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Schedule Of Accounting Policies [Line Items]

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Face amount per share of no-par value common stock.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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