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Subsidiary Preferred Shares - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
7 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aug. 15, 2012
Subsidiary or Equity Method Investee [Line Items]          
Preferred stock shares value     $ 1,786    
Preferred Class A
         
Subsidiary or Equity Method Investee [Line Items]          
Preferred stock shares value     1,800   1,300
Preferred stock shares, accumulated voting interest     8.90%   8.90%
Class A preferred shares, entitled to cumulative dividends percentage   10.00% 10.00%    
Class A preferred shares, cumulative dividends $ (469)   $ 321 $ 148