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Common Stock and Other Equity Related Transactions - Additional Information (Detail) - $ / shares | 3 Months Ended
--- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
Class of Stock [Line Items] |  |  |
Preferred stock dividends paid (usd per share) | $ 0.421875 | $ 0.421875 | $ 0.421875
Common Stock dividends paid (usd per share) | $ 0.375 | $ 0.375 | $ 0.375
6.75% Series C Cumulative Redeemable Perpetual Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Date to be paid | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
Date of record | Sep. 18, 2015 | Jun. 19, 2015 | Mar. 20, 2015
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Date to be paid | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015
Date of record | Sep. 25, 2015 | Jun. 26, 2015 | Mar. 27, 2015

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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