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Tax Characterization of Dividends per Share on Common Shares (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |
Total Per Share |  | $ 0.44 | $ 1.76 | $ 1.72
Dividend Payment 1st |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Feb. 22, 2018 |  |
Record Date |  | Apr. 02, 2018 |  |
Payable Date |  | Apr. 16, 2018 |  |
Ordinary Income | [1] | $ 0.396671 |  |
Return of Capital |  | 0.033329 |  |
Total Per Share |  | $ 0.43 |  |
Dividend Payment 2nd |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | May 11, 2018 |  |
Record Date |  | Jul. 02, 2018 |  |
Payable Date |  | Jul. 16, 2018 |  |
Ordinary Income | [1] | $ 0.396671 |  |
Return of Capital |  | 0.033329 |  |
Total Per Share |  | $ 0.43 |  |
Dividend Payment 3rd |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Aug. 16, 2018 |  |
Record Date |  | Oct. 01, 2018 |  |
Payable Date |  | Oct. 15, 2018 |  |
Ordinary Income | [1] | $ 0.396671 |  |
Return of Capital |  | 0.033329 |  |
Total Per Share |  | $ 0.43 |  |
Dividend Payment 4th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Dec. 13, 2018 |  |
Record Date |  | Jan. 02, 2019 |  |
Payable Date |  | Jan. 15, 2019 |  |
Ordinary Income | [2] | $ 0.374927 |  |
Return of Capital |  | 0.055073 |  |
Total Per Share |  | $ 0.43 |  |
Dividend Payment 5th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Feb. 21, 2019 |  |
Record Date |  | Apr. 01, 2019 |  |
Payable Date |  | Apr. 15, 2019 |  |
Ordinary Income | [3] | $ 0.383646 |  |
Return of Capital |  | 0.056354 |  |
Total Per Share |  | $ 0.44 |  |
Dividend Payment 6th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | May 16, 2019 |  |
Record Date |  | Jul. 01, 2019 |  |
Payable Date |  | Jul. 16, 2019 |  |
Ordinary Income | [3] | $ 0.383646 |  |
Return of Capital |  | 0.056354 |  |
Total Per Share |  | $ 0.44 |  |
Dividend Payment 7th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Aug. 15, 2019 |  |
Record Date |  | Oct. 01, 2019 |  |
Payable Date |  | Oct. 15, 2019 |  |
Ordinary Income | [3] | $ 0.383646 |  |
Return of Capital |  | 0.056354 |  |
Total Per Share |  | $ 0.44 |  |
Dividend Payment 8th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Dec. 12, 2019 |  |
Record Date |  | Jan. 06, 2020 |  |
Payable Date |  | Jan. 15, 2020 |  |
Ordinary Income | [4] | $ 0.440000 |  |
Total Per Share |  | $ 0.44 |  |
Dividend Payment 9th |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration Date |  | Feb. 20, 2020 |  |
Record Date |  | Apr. 01, 2020 |  |
Payable Date |  | Apr. 15, 2020 |  |
Ordinary Income | [4] | $ 0.440000 |  |
Total Per Share |  | $ 0.44 |  |
[1] | $0.053074 of this amount constitutes a "Qualified Dividend", as defined by the IRS.
[2] | $0.041413 of this amount constitutes a "Qualified Dividend", as defined by the IRS.
[3] | $0.042774 of this amount constitutes a "Qualified Dividend", as defined by the IRS.
[4] | $0.040745 of this amount constitutes a "Qualified Dividend", as defined by the IRS.

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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