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Securities Offerings - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
Nov. 14, 2013
Nov. 01, 2013
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity [Line Items]        
Public offering, common stock   4,693,876    
Common stock per share price   $ 12.25    
Net proceeds from common stock offerings $ 54,434   $ 3,755 $ (696)
Net proceeds from preferred stock offerings $ 106,882      
Series E [Member]
        
Stockholders' Equity [Line Items]        
Public offering, depositary shares   4,000,000    
Depositary shares, price per share   $ 25.00    
Common Stock Over-Allotment Option [Member]
        
Stockholders' Equity [Line Items]        
Public offering, common stock   612,244    
Preferred Stock Over-Allotment Option [Member]
        
Stockholders' Equity [Line Items]        
Public offering, depositary shares 435,080