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PARTNERS' CAPITAL (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Limited Partner
item
Jan. 31, 2012
Class A
Dec. 31, 2012
Class A
Feb. 04, 2013
Class A
Sep. 30, 2012
Class A
Jun. 30, 2012
Class A
Mar. 31, 2012
Class A
Jan. 03, 2012
Class A
Dec. 31, 2011
Class A
Sep. 30, 2011
Class A
Jun. 30, 2011
Class A
Mar. 31, 2011
Class A
Dec. 31, 2010
Class A
Sep. 30, 2010
Class A
Jun. 30, 2010
Class A
Mar. 31, 2010
Class A
Aug. 20, 2007
Class A
Dec. 31, 2012
Class B
Dec. 31, 2012
General Partnership
item
Number of classes of limited partners                         2                                   1
Fixed distribution percentage of unit holders                             80.00%                             19.00% 1.00%
Forward split of depositary receipts 3                                                            
Exchange ratio of depositary receipts for partnership units before adjustment                           10                                  
Exchange ratio of depositary receipts for partnership units after adjustment                           30                                  
Number of units in each depository receipt                                       0.03333                 0.1    
Quarterly distribution per unit (in dollars per unit)                             $ 7.50 $ 7.50 $ 7.50 $ 7.50 $ 7.50   $ 7.00 $ 7.00 $ 7.00 $ 7.00 $ 7.00 $ 7.00 $ 7.00 $ 7.00      
Quarterly distributions per depositary receipt (in dollars per share)                             $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25   $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.23 $ 0.23      
Distribution per unit (in dollars per unit)   $ 30.00       $ 28.00       $ 30.00 $ 28.00 $ 28.00                                      
Earnings per depository receipt                                                              
Income per Depositary Receipt before Discontinued Operations (in dollars per share)   $ 0.30 $ 0.20 $ 0.27 $ 0.16 $ 0.15 $ 0.12 $ 0.09 $ 0.02 $ 0.92 $ 0.38                                        
Income from Discontinued Operations (in dollars per share)   $ 0.00 $ 0.00 $ 0.00 $ 0.00     $ 1.96 $ 0.02 $ 0.00 $ 1.98                                        
Net Income (loss) per Depositary Receipt after Discontinued Operations (in dollars per share)           $ 0.15 $ 0.12 $ 2.05 $ 0.04 $ 0.92 $ 2.36                                        
Distributions per Depositary Receipt (in dollars per share)   $ 1.00       $ 0.93       $ 1.00 $ 0.93 $ 0.93