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Common Stock and Other Equity Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 13, 2018 | Apr. 13, 2018 | Jun. 30, 2018 | Jul. 26, 2018
Class of Stock [Line Items] |  |  |  |
Common stock, dividends paid (usd per share) |  | $ 0.550 |  |
OP units were exchanged for an equal number of shares of common stock (OP Units) |  |  | 13,838 |
Private Placement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, available for issuance |  |  | $ 150.0 |
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, dividends paid (usd per share) | $ 0.5500 |  |  |
Subsequent Event | Private Placement |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, available for issuance |  |  |  | $ 126.8

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