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Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 10, 2017 | Sep. 30, 2016
10/31/2017 |  |  |
Subsequent Event [Line Items] |  |  |
Record Date | Oct. 20, 2017 |  |
Payment Date | Oct. 31, 2017 |  |
11/30/2017 |  |  |
Subsequent Event [Line Items] |  |  |
Record Date | Nov. 20, 2017 |  |
Payment Date | Nov. 30, 2017 |  |
12/29/2017 |  |  |
Subsequent Event [Line Items] |  |  |
Record Date | Dec. 19, 2017 |  |
Payment Date | Dec. 29, 2017 |  |
Common Stock | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | $ 0.1323 |
Common Stock | 10/31/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.0441 |
Common Stock | 11/30/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.0441 |
Common Stock | 12/29/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.0441 |
Preferred Stock | Term Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share | $ 1.1953125 |  | $ 0.190364583
Preferred Stock | Term Preferred Stock | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.3984375 |
Preferred Stock | Term Preferred Stock | 10/31/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.1328125 |
Preferred Stock | Term Preferred Stock | 11/30/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | 0.1328125 |
Preferred Stock | Term Preferred Stock | 12/29/2017 | Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Distributions per share |  | $ 0.1328125 |

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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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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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