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Common Stock and Other Equity Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 12, 2018 | Jul. 13, 2018 | Apr. 13, 2018 | Jan. 12, 2018 | Oct. 13, 2017 | Sep. 25, 2017 | Jul. 14, 2017 | Jun. 30, 2017 | Apr. 14, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Nov. 02, 2017 | Nov. 01, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends paid (usd per share) |  | $ 0.5500 | $ 0.550 | $ 0.4875 | $ 0.4875 |  | $ 0.4875 |  | $ 0.4875 |  |  |  |  |  |
Common stock, par value (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |
Common stock, available for issuance |  |  |  |  |  |  |  |  |  |  | $ 71,200 |  |  |  |
OP units were exchanged for an equal number of shares of common stock (OP Units) |  |  |  |  |  |  |  |  |  |  | 87,718 | 1,335,247 |  |  |
Preferred stock, dividend rate (percentage) |  |  |  |  |  |  |  |  |  |  | 6.75% |  |  |  |
Series C Preferred stock redemption |  |  |  |  |  |  |  |  |  |  |  | $ 138,400 |  |  |
Dividends paid per share (usd per share) |  |  |  |  |  | $ 0.421875 |  | $ 0.421875 |  | $ 0.421875 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends paid (usd per share) | $ 0.5500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 125,000

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