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Stockholders' Equity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 3 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jul. 28, 2014 Common Stock [Member] | Apr. 29, 2014 Common Stock [Member] | Feb. 26, 2014 Common Stock [Member] | Sep. 08, 2014 Series A Preferred Stock [Member] | Jun. 09, 2014 Series A Preferred Stock [Member] | Mar. 17, 2014 Series A Preferred Stock [Member] | Sep. 30, 2014 Series A Preferred Stock [Member] | Jun. 30, 2014 Follow-on Public Offering [Member] Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock after completion of follow-on public offering |  |  |  |  |  |  |  |  |  |  |  |  | 9,706,000
Price per share of newly issued common stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.35
Proceeds from issuance of common stock as a result of follow-on public offering |  | $ 158,439 |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share of common stock | $ 0.40 |  | $ 0.40 | $ 1.2 | $ 1.2 | $ 0.4 | $ 0.4 | $ 0.40 |  |  |  |  |
Dividend rate, preferred stock |  |  |  |  |  |  |  |  |  |  |  | 8.625% |
Dividend declared per share of preferred stock |  |  |  |  |  |  |  |  | $ 0.5391 | $ 0.5391 | $ 0.5391 |  |

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