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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 14, 2016 | Jun. 17, 2016 | Mar. 15, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock as a result of follow-on public offering |  |  |  |  |  | $ 193,148 |  |  |
Dividend declared per share of common stock (in dollars per share) |  |  |  | $ 0.46 | $ 0.44 |  | $ 1.38 | $ 1.32 |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend declared per share of common stock (in dollars per share) | $ 0.46 | $ 0.46 | $ 0.46 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock |  |  |  |  |  |  | 8.625% |  |
Dividend declared per share of preferred stock (in dollars per share) | 0.5391 | 0.5391 | 0.5391 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock |  |  |  |  |  |  | 8.00% |  |
Dividend declared per share of preferred stock (in dollars per share) | 0.5000 | $ 0.5000 | $ 0.50 |  |  |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock |  |  |  |  |  |  | 8.00% |  |
Dividend declared per share of preferred stock (in dollars per share) | $ 0.5000 |  |  |  |  |  |  |  |
Follow On Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
New issuance of stock (shares) |  |  |  |  |  | 11,500,000 |  |  |
Price per share of newly issued stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 16.82

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