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Stock-based Compensation Plans - PS/RS-PSUs Activities (Parenthetical) (Detail) - Performance-based PS-PSUs and RS-PSUs - shares | 1 Months Ended | 6 Months Ended
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May 31, 2017 | Mar. 31, 2017 | Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares vested and issued related to performance period number of common stock | [1] |  |  | 101,150
March 2017 Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate payout of shares issued |  |  | 150.00% |
Shares vested and issued related to performance period number of common stock |  | 58,591 |  |
May 2017 Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate payout of shares issued |  |  |  | 150.00%
Shares vested and issued related to performance period number of common stock |  |  |  | 58,591
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] | For the PS-PSUs and RS-PSUs awards issued during 2017 the aggregate payout was approximately 150% of target for the March 2017 and May 2017 grants with a positive performance adjustment of 58,591 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=116856206&loc=d3e5070-113901 + Details
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