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Dividends/Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Dividends [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared |  |  |  |  |  |  |  | $ 269,502 | $ 81,534
Dividends declared, per share | $ 0.96 | $ 0.96 | $ 0.96 | $ 0.91 | $ 0.91 | $ 0.91 | $ 2.88 | $ 2.73 | $ 0.83
Distributions paid, preferred stockholders | $ 91 |  |  | $ 91 |  |  | $ 273 | $ 364 |
Distributions paid, preferred stockholders, per share | $ 15.95 |  |  | $ 15.95 |  |  | $ 47.85 | $ 63.80 |
Distributions paid | $ 96,390 |  |  | $ 90,177 |  |  | $ 288,344 | $ 351,036 |
Distributions paid, per share | $ 0.96 |  |  | $ 0.91 |  |  | $ 2.88 | $ 3.56 |

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- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: 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=27012166&loc=d3e187085-122770 + Details
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