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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Mar. 15, 2016 | Mar. 31, 2016 | Mar. 31, 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
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Dividend declared per share of common stock (in dollars per share) | $ 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 |  |
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) | $ 0.50 |  |
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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