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Stockholder Equity and Non-Controlling Interest - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
May 07, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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
Feb. 28, 2013
Subsequent event
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Subsequent event
Distributions declared for the months of April through June 2013
Feb. 28, 2013
Subsequent event
Noncontrolling Interest
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Subsequent event
Noncontrolling Interest
Distributions declared for the months of April through June 2013
Dec. 31, 2012
Nonaffiliated Entity
Dec. 31, 2012
Affiliated Entity
Jan. 04, 2012
Series Cumulative Non-Voting Preferred Stock
Dec. 31, 2012
Series Cumulative Non-Voting Preferred Stock
Person
Aug. 19, 2013
Series A Preferred Stock
Feb. 28, 2013
Series A Preferred Stock
Aug. 09, 2012
Series A Preferred Stock
May 10, 2012
Series A Preferred Stock
Feb. 28, 2013
Series A Preferred Stock
Dividend Declared
Dec. 31, 2012
Common Stock
Sep. 30, 2012
Common Stock
Jun. 30, 2012
Common Stock
Mar. 31, 2012
Common Stock
Nov. 05, 2012
Common Stock
Aug. 09, 2012
Common Stock
May 10, 2012
Common Stock
Feb. 15, 2012
Common Stock
Feb. 28, 2013
Common Stock
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Common Stock
Distributions declared for the months of April through June 2013
Feb. 28, 2013
Common Stock
Dividend Declared
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Common Stock
Dividend Declared
Distributions declared for the months of April through June 2013
Oct. 31, 2012
Series B Preferred Units
Dec. 31, 2012
Series B Preferred Units
Oct. 11, 2012
Series B Preferred Units
Class of Stock [Line Items]                                                                                
Preferred stock, shares issued   125       0   125 0                   125                                          
Preferred Stock par value per share                                     $ 0.01                                          
Preferred Stock, Dividend Rate, Percentage                                     12.50% 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%                              
Number of investors                                       125                                        
Share price                                           $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00                     $ 10.00 $ 10.00      
Preferred stock rate                                           $ 0.34722222 $ 0.34722222 $ 0.34722222 $ 0.34153005                              
Preferred stock, distribution payment date                                           Jun. 28, 2013     Jun. 30, 2013                              
Common stock for months                                                           October, November and December 2012 July, August and September 2012 April, May and June 2012 January, February and March 2012 January through June 2013 April through June 2013 January through March 2013 April through June 2013      
Dividend rate of common stock                                                   $ 0.00163934 $ 0.00163934 $ 0.00163934 $ 0.00163934         $ 0.00163934 $ 0.00171233 $ 0.00163934 $ 0.00171233      
Dividend paid                                                   $ 50 $ 48 $ 48 $ 19                      
Common stock annualized distribution rate                                                                       6.00% 6.25%      
Common stock, shares issued   25,000                             25,063 300,000                                            
Proceeds from issuance of common stock   3,000     3,000 31,461 3,015 3,193 0 0             225 3,000                                            
Non-controlling Interest for months   October, November and December 2012 July, August and September 2012 April, May and June 2012 January, February and March 2012           January through June 2013 April through June 2013 January through March 2013 April through June 2013                                                 October 11, 2012 through December 31, 2012  
Non-controlling Interest per unit per day   $ 0.00163934 $ 0.00163934 $ 0.00163934 $ 0.00163934           $ 0.00163934 $ 0.00171233 $ 0.00163934 $ 0.00171233                                                    
Non-controlling Interest total   796 796 787 789                                                                   79  
Series B Preferred Units, limited partnership units established                                                                               400
Series B Preferred Units, preferential cash distributions percentage                                                                           10.00%    
Series B Preferred Units, purchase price per unit base for preferential cash distributions percentage                                                                           $ 10,000    
Series B Preferred Units, limited partnership units issued                                                                               350
Series B Preferred Units, proceeds from issuance of limited partnership units                                                                           $ 3,500    
Non-controlling Interest distribution rate                                                                             $ 2.78  
Non-controlling Interest, percentage of annualized distribution rate                             6.00% 6.25%                                                
Common Operating Partnership Unit Price                           10.00 10.00                                                  
Non-controlling Interest distribution rate $ 2.78         $ 2.78   $ 2.78