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Summary of Performance option activity (Detail) - Performance Based Stock Options	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Price Per Share, Beginning balance | $ / shares	$ 11.49
Weighted Average Price Per Share, Options exercised | $ / shares	11.49
Weighted Average Price Per Share, Ending balance | $ / shares	$ 11.49
Incentive Stock Option Plans, Beginning balance | shares	120,782
Incentive Stock Option Plans, Options exercised | shares	(3,035)
Incentive Stock Option Plans, Ending balance | shares	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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Number of share options (or share units) exercised during the current period.

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