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Common Stock and Other Equity Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 14, 2016 | Sep. 30, 2016 | Jul. 08, 2016 | Jun. 30, 2016 | Apr. 08, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | May 04, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, dividends paid (usd per share) |  |  | $ 0.4250 |  | $ 0.425 |  |  |  |  |
Common Stock, par or stated value per share (usd per share) |  | $ 0.01 |  |  |  |  | $ 0.01 |  | $ 0.01 |
Commissions paid to sales agents |  |  |  |  |  |  | $ 824 | $ 424 |  |
6.75% Series C Cumulative Redeemable Perpetual Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock dividends paid (usd per share) |  | $ 0.421875 |  | $ 0.421875 |  | $ 0.421875 |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate Offering price |  |  |  |  |  |  |  |  |  | $ 125,000
Total gross proceeds |  |  |  |  |  |  | 50,000 |  |  |
Common stock remained available for issuance |  | $ 75,000 |  |  |  |  | $ 75,000 |  |  |
Private Placement | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock sold (shares) |  |  |  |  |  |  | 683,548 |  |  |
Weighted average price per share (usd per share) |  |  |  |  |  |  | $ 73.15 |  |  |
Commissions paid to sales agents |  |  |  |  |  |  | $ 657 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, dividends paid (usd per share) | $ 0.4250 |  |  |  |  |  |  |  |  |

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