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Summary of Performance option activity (Detail) - Performance Based Stock Options - $ / shares | 3 Months Ended
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Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incentive Stock Option Plans, Beginning balance | 114,658 | 114,658 | 117,747 | 120,782
Incentive Stock Option Plans, Options exercised | 0 |  |  | (3,035)
Incentive Stock Option Plans, Ending balance | 114,658 | 114,658 | 117,747 | 117,747
Weighted Average Price Per Share, Beginning balance | $ 11.49 | $ 11.49 | $ 11.49 | $ 11.49
Weighted Average Price Per Share, Options exercised | 0 |  |  | 11.49
Weighted Average Price Per Share, Ending balance | $ 11.49 | $ 11.49 | $ 11.49 | $ 11.49

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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