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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Loss - Schedule of Distributions Declared and paid (Details) - $ / shares |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Feb. 26, 2020 | Nov. 05, 2019 | Aug. 13, 2019 | May 09, 2019 | Feb. 28, 2019 | Nov. 13, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  |  | $ 0 | $ 0.28 | $ 0.29 | $ 0.84
Fourth Quarter Two Thousand Eighteen |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | Nov. 13, 2018 |
Cash dividends declared per common share (in dollars per share) |  |  |  |  |  | $ 0.28 |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Dec. 31, 2018 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Jan. 15, 2019 |
First Quarter Two Thousand Nineteen |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | Feb. 28, 2019 |
Cash dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.28 |  |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Mar. 29, 2019 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Apr. 15, 2019 |
Second Quarter Two Thousand Nineteen |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | May 09, 2019 |
Cash dividends declared per common share (in dollars per share) |  |  |  | $ 0.28 |  |  |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Jun. 28, 2019 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Jul. 15, 2019 |
Third Quarter Two Thousand Nineteen |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | Aug. 13, 2019 |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.28 |  |  |  |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Sep. 30, 2019 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Oct. 15, 2019 |
Fourth Quarter Two Thousand Nineteen |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | Nov. 05, 2019 |
Cash dividends declared per common share (in dollars per share) |  | $ 0.29 |  |  |  |  |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Dec. 31, 2019 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Jan. 15, 2020 |
First Quarter Two Thousand Twenty |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends, declared date |  |  |  |  |  |  |  |  | Feb. 26, 2020 |
Cash dividends declared per common share (in dollars per share) | $ 0.29 |  |  |  |  |  |  |  |  |
Cash dividends, record date |  |  |  |  |  |  |  |  | Mar. 31, 2020 |
Cash dividends, paid date |  |  |  |  |  |  |  |  | Apr. 15, 2020 |

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