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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 21, 2015 | Sep. 09, 2015 | Jul. 28, 2015 | Jun. 09, 2015 | Apr. 28, 2015 | Mar. 16, 2015 | Feb. 25, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock as a result of follow-on public offering |  |  |  |  |  |  |  |  | $ 193,148 |  |  |
Placement agent fees paid |  |  |  |  |  |  |  |  |  |  | $ 956 | $ 308
Payments for repurchase of common stock |  |  |  |  |  |  |  |  |  |  | $ 1,741 | $ 0
Dividend declared per share of common stock (in dollars per share) |  |  |  |  |  |  |  | $ 0.44 |  | $ 0.40 | $ 1.32 | $ 1.2
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per share of common stock (in dollars per share) |  |  | $ 0.44 |  | $ 0.44 |  | $ 0.44 |  |  |  |  |
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 |  |  |  |  |  |
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 |  |  |
Private Offering [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New issuance of stock (shares) | 8,000,000 |  |  |  |  |  |  |  |  |  |  |
Price per share of newly issued stock (in dollars per share) | $ 24.71 |  |  |  |  |  |  |  |  |  |  |
Dividend rate, preferred stock | 8.00% |  |  |  |  |  |  |  |  |  |  |
Liquidation preference (in dollars per share) | $ 25.00 |  |  |  |  |  |  |  |  |  |  |
Proceeds from private offering | $ 346,855 |  |  |  |  |  |  |  |  |  |  |
Placement agent fees paid | $ 500 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period (shares) |  |  |  |  |  |  |  | 107,432 |  |  | 107,432 |
Average price of stock repurchased during period (in dollars per share) |  |  |  |  |  |  |  | $ 16.20 |  |  |  |
Payments for repurchase of common stock |  |  |  |  |  |  |  | $ 1,741 |  |  |  |
Common Stock [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New issuance of stock (shares) |  |  |  |  |  |  |  |  |  |  | 20,323,529 |
Common Stock [Member] | Private Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New issuance of stock (shares) | 8,823,529 |  |  |  |  |  |  |  |  |  |  |
Price per share of newly issued stock (in dollars per share) | $ 17.00 |  |  |  |  |  |  |  |  |  |  |

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