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Equity - Summary of Dividends Declared (Parenthetical) (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 28, 2020 | Jun. 08, 2015 | Nov. 05, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Series JJ 10% Cumulative Convertible Preferred Stock [Member] |  |  |  |  |  |
Disclosure Of Dividends [Line Items] |  |  |  |  |  |
Cumulative dividends annual rate | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00%

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- Details
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