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Shareholder Equity and Non Controlling Interests - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
May 14, 2014
Oct. 29, 2013
Jul. 21, 2014
Underwritten public offering
Jan. 29, 2014
Underwritten public offering
Jul. 21, 2014
Underwritten public offering
Jan. 29, 2014
Underwritten public offering
May 07, 2014
Noncontrolling Interest
Carrington
Aug. 28, 2014
Noncontrolling Interest
Walnut Hill
Class of Stock [Line Items]                    
Public offering         8,050,000 8,050,000        
Share price     $ 8.95 $ 8.60     $ 9.50 $ 8.30    
Proceeds from issuance of common stock, gross         $ 76,475 $ 66,815        
Proceeds from issuance of common stock, net 134,881 31,461     72,002 62,718        
Number of limited units issued                 222,062 137,361
Limited units issued value                 $ 1,986 $ 1,377