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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Option Plans, Beginning balance	134,676	140,411	140,411
Incentive Stock Options Plans, Options exercised		(5,735)	(5,735)
Incentive Stock Option Plans, Ending balance	134,676	134,676	134,676
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49
Weighted Average Price Per Share, Options exercised		11.49	11.49
Weighted Average Price Per Share, Ending balance	11.49	11.49	11.49
Exercisable Weighted Average Price Per Share, Beginning balance	11.49	11.49	11.49
Exercisable Weighted Average Price Per Share, Options exercised	11.49	11.49	11.49
Exercisable Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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