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Equity - Monthly Distributions Declared and Paid by Company's Board of Directors (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Distributions per Preferred Share (in dollars per share) | $ 1.59375 | $ 1.59375
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Distributions per Preferred Share (in dollars per share) | 0.875 | 0
Common Stock |  |
Class of Stock [Line Items] |  |
Distributions per Common Share (in dollars per share) | $ 0.5319 | $ 0.5238

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- Definition Aggregate dividends paid 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=27012166&loc=d3e187085-122770 + Details
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