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Stockholders' Equity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Apr. 29, 2014
Common Stock [Member]
Feb. 26, 2014
Common Stock [Member]
Jun. 09, 2014
Series A Preferred Stock [Member]
Mar. 17, 2014
Series A Preferred Stock [Member]
Jun. 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 $ 158,398                  
Dividend declared per share of common stock $ 0.40 $ 0.40 $ 0.8 $ 0.8 $ 0.4 $ 0.40        
Dividend rate, preferred stock                 8.625%  
Dividend declared per share of preferred stock             $ 0.5391 $ 0.5391