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Shareholder Equity and Non Controlling Interests - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
May 07, 2013
Feb. 28, 2013
Jun. 30, 2014
Jun. 30, 2013
May 14, 2014
Dec. 31, 2013
Oct. 29, 2013
Jul. 25, 2013
May 07, 2013
Subsidiaries
Jan. 29, 2014
Underwritten public offering
Jan. 29, 2014
Underwritten public offering
Jul. 21, 2014
Underwritten public offering
Subsequent event
Jul. 21, 2014
Underwritten public offering
Subsequent event
May 07, 2014
Noncontrolling Interest
Carrington
Feb. 28, 2013
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Distributions declared for the months of April through June 2013
Aug. 19, 2013
Series A Preferred Stock
Feb. 28, 2013
Series A Preferred Stock
Aug. 19, 2013
Series A Preferred Stock
Feb. 28, 2013
Series A Preferred Stock
Aug. 19, 2013
Series B Units
Aug. 19, 2013
Series B Units
Class of Stock [Line Items]                                            
Preferred stock rate                                   $ 0.34722222        
Preferred Stock, percentage of annualized distribution rate                                 12.50% 12.50%        
Share price         $ 8.95   $ 8.60       $ 8.30   $ 9.50             $ 1,000.00    
Preferred stock, distribution payment date                                   Jun. 28, 2013        
Preferred stock, shares redeemed                                 125       350  
Preferred Stock redemption price                                 $ 140       $ 3,500  
Preferred stock, shares outstanding     0     0                         0     0
Public offering                   8,050,000   8,050,000                    
Proceeds from issuance of common stock, gross                   66,815   76,475                    
Proceeds from issuance of common stock, net     62,799 207           62,984   72,425                    
Common stock for months                             January through June 2013 April through June 2013            
Dividend rate of common stock                             $ 0.00163934 $ 0.00171233            
Number of limited units issued                           222,062                
Limited units issued value                           $ 1,986                
Limited partnership interest received in exchange for issuance of common stock                 5,274,900                          
Non-controlling Interest distribution rate $ 2.78 $ 2.78                                        
Preferred stock redemption price               $ 10