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Stockholder Equity and Non Controlling Interest - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 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
Noncontrolling Interest
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Noncontrolling Interest
Distributions declared for the months of April through June 2013
May 07, 2013
Subsequent Event
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
Mar. 31, 2013
Series Cumulative Non-Voting Preferred Stock
Person
Dec. 31, 2012
Series Cumulative Non-Voting Preferred Stock
Person
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 rate                                             $ 0.34722222 $ 0.34722222 $ 0.34722222 $ 0.34153005                              
Preferred Stock, Dividend Rate, Percentage                                       12.50%   12.50% 12.50% 12.50% 12.50% 12.50%                              
Share Price                                             $ 1,000.00 $ 1,000.00 $ 1,000.00 $ 1,000.00                 $ 10.00 $ 10.00 $ 10 $ 10      
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      
Common stock annualized distribution rate                                                                     6.00% 6.25% 6.00% 6.25%      
Dividend rate of common stock                                                     $ 0.00163934 $ 0.00163934 $ 0.00163934 $ 0.00163934         $ 0.00163934 $ 0.00171233 $ 0.00163934 $ 0.00171233      
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, percentage of annualized distribution rate                     6.00% 6.25%       6.00% 6.25%                                                
Common Operating Partnership Unit Price                   10.00 10.00       10 10                                                  
Non-controlling Interest distribution rate $ 2.78         $ 2.78             $ 2.78                                                     $ 2.78  
Redemption price of series B preferred unit $ 10 $ 10       $ 10                                                                      
Preferred stock, shares issued 125 125       125 0                         125                                          
Preferred Stock par value per share                                       $ 0.01                                          
Number of investors                                         125 125                                      
Dividend paid                                                     $ 50 $ 48 $ 48 $ 19                      
Common stock, shares issued 11,300 25,000                               25,063 300,000                                            
Proceeds from issuance of common stock 102 3,000     3,000 3,193 0 0                   225 3,000                                            
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