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Shareholder Equity and Non Controlling Interests - 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 3 Months Ended 1 Months Ended
May 07, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2013
Dec. 31, 2012
Jul. 25, 2013
Dec. 31, 2011
May 07, 2013
Subsidiaries
Feb. 28, 2013
Distributions declared for the months of January through March 2013
Feb. 28, 2013
Distributions declared for the months of January through March 2013
Subsequent event
Feb. 28, 2013
Distributions declared for the months of April through June 2013
Feb. 28, 2013
Distributions declared for the months of April through June 2013
Subsequent event
Jul. 25, 2013
Distributions declared for the months of July through September 2013
Oct. 10, 2013
Distributions declared for the months of July through September 2013
Subsequent event
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
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
Aug. 19, 2013
Series B Units
Class of Stock [Line Items]                                                              
Preferred stock rate                                   $ 0.34722222 $ 0.34722222 $ 0.34722222                      
Preferred Stock, percentage of annualized distribution rate                                 12.50% 12.50% 12.50% 12.50%                      
Share price                                   $ 1,000.00 $ 1,000.00 $ 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   125       0 125   0               0                           0
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  
Dividend rate of common stock                                         $ 0.00163934 $ 0.00163934 $ 0.00163934 $ 0.00163934         $ 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 January through March 2013 April through June 2013 April through June 2013 July through September 2013 July through September 2013                              
Non-controlling Interest per unit per day   $ 0.00163934 $ 0.00163934 $ 0.00163934 $ 0.00163934           $ 0.00163934 $ 0.00163934 $ 0.00171233 $ 0.00171233                                  
Limited partnership interest received in exchange for issuance of common stock                   5,274,900                                          
Non-controlling Interest distribution rate $ 2.78         $ 2.78 $ 2.78                                                
Preferred stock redemption price               $ 10