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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares	3 Months Ended			6 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Beginning balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49
Weighted Average Price Per Share, Options exercised	11.49		11.49	11.49	11.49
Weighted Average Price Per Share, Ending balance	$ 11.49	$ 11.49	$ 11.49	$ 11.49	$ 11.49
Incentive Stock Option Plans, Beginning balance	117,747	117,747	120,782	117,747	120,782
Incentive Stock Option Plans, Options exercised	(3,089)		(3,035)	(3,089)	(3,035)
Incentive Stock Option Plans, Ending balance	114,658	117,747	117,747	114,658	117,747

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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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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