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Stock-based Compensation Plans - Internal Performance Activities (Parenthetical) (Detail) - Performance-based PS-PSUs and RS-PSUs - shares | 1 Months Ended | 6 Months Ended
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Mar. 31, 2018 | Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares vested and issued related to performance period number of common stock | [1] |  | 306,978
March 2018 Grant |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Actual payout of shares |  | 137.00% |
Shares vested and issued related to performance period number of common stock |  | 290,140 |
Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted |  |  | 0.00%
Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Potential payout of shares granted |  |  | 200.00%
[1] | (b) For certain of the PS-PSUs and RS-PSUs awards issued during 2018 the aggregate payout was approximately 137% of target for the March 2018 grants with a positive performance adjustment of 290,140 shares.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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