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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares | Oct. 05, 2018 | Sep. 28, 2018 | Sep. 25, 2018 | Sep. 19, 2018 | Aug. 31, 2018 | Aug. 21, 2018 | Aug. 03, 2018 | Jul. 31, 2018 | Jul. 24, 2018 | Jul. 20, 2018 | Aug. 08, 2018
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Period One | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  |  |  |  | Jul. 24, 2018 | Jul. 20, 2018 |
Payment Date |  |  |  |  |  |  | Aug. 03, 2018 | Jul. 31, 2018 |  |  |
Series A Preferred Stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  |  |  |  |  | $ 0.3984
Series A Preferred Stock | Period One | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  |  | $ 0.1328 |  |  |
Series B Preferred Stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  |  |  |  |  | 0.375
Series B Preferred Stock | Period One | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  | $ 0.125 |  |  |  |
Common Stock | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  |  |  |  |  | $ 0.13305
Common Stock | Period One | Subsequent event |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  |  |  |  | $ 0.04435 |  |  |
Forecast | Period Two |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  |  |  |  | Aug. 21, 2018 |  |  |  |  |
Payment Date |  |  |  |  | Aug. 31, 2018 |  |  |  |  |  |
Forecast | Period Three |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Record Date |  |  | Sep. 25, 2018 | Sep. 19, 2018 |  |  |  |  |  |  |
Payment Date | Oct. 05, 2018 | Sep. 28, 2018 |  |  |  |  |  |  |  |  |
Forecast | Series A Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  | $ 0.1328 |  |  |  |  |  |
Forecast | Series A Preferred Stock | Period Three |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  | $ 0.1328 |  |  |  |  |  |  |  |  |
Forecast | Series B Preferred Stock | Period Two |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  | 0.125 |  |  |  |  |  |
Forecast | Series B Preferred Stock | Period Three |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share | $ 0.125 |  |  |  |  |  |  |  |  |  |
Forecast | Common Stock | Period Two |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  |  |  |  | $ 0.04435 |  |  |  |  |  |
Forecast | Common Stock | Period Three |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Distributions per share |  | $ 0.04435 |  |  |  |  |  |  |  |  |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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