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Dividends Declared (Detail) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend Declared Per Share |  |  |  |  |  |  |  |  | $ 0.54 | $ 0.72 | $ 0.72
Dividend Declared |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Declaration Date | Dec. 14, 2020 | Sep. 15, 2020 | Jun. 15, 2020 | Mar. 16, 2020 | Dec. 16, 2019 | Sep. 12, 2019 | Jun. 17, 2019 | Mar. 18, 2019 |  |  |
Record Date | Dec. 30, 2020 | Oct. 02, 2020 | Jul. 02, 2020 | Apr. 02, 2020 | Dec. 26, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 |  |  |
Payment Date | Jan. 22, 2021 | Oct. 23, 2020 | Jul. 24, 2020 | Apr. 24, 2020 | Jan. 24, 2020 | Oct. 25, 2019 | Jul. 25, 2019 | Apr. 25, 2019 |  |  |
Dividend Declared Per Share | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |
Dividend Declared | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Declaration Date | Dec. 14, 2020 | Sep. 15, 2020 | Jun. 15, 2020 | Mar. 16, 2020 | Dec. 16, 2019 | Sep. 12, 2019 | Jun. 17, 2019 | Mar. 18, 2019 |  |  |
Record Date | Dec. 30, 2020 | Oct. 02, 2020 | Jul. 02, 2020 | Apr. 02, 2020 | Dec. 26, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 |  |  |
Payment Date | Jan. 22, 2021 | Oct. 23, 2020 | Jul. 24, 2020 | Apr. 24, 2020 | Jan. 24, 2020 | Oct. 25, 2019 | Jul. 25, 2019 | Apr. 25, 2019 |  |  |
Dividend Declared Per Share | $ 0.12 | $ 0.12 | $ 0.12 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.18 |  |  |

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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