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

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