SUBSEQUENT EVENTS (Details) (USD $)	3 Months Ended		79 Months Ended	3 Months Ended		79 Months Ended	3 Months Ended		79 Months Ended	3 Months Ended		79 Months Ended	1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014 Class B Units	Mar. 31, 2013 Class B Units	Mar. 31, 2014 Class B Units	Mar. 31, 2014 General Partnership units	Mar. 31, 2013 General Partnership units	Mar. 31, 2014 General Partnership units	Mar. 31, 2014 Class A units	Mar. 31, 2013 Class A units	Mar. 31, 2014 Class A units	May 06, 2014 Subsequent events	May 06, 2014 Subsequent events Class B Units	May 06, 2014 Subsequent events General Partnership units
Subsequent events
Repurchase of depository receipts	6,513		1,249,404			2,155							3,832
Repurchase price of depository receipts	$ 45.56		$ 24.97										$ 45.67
Repurchase price of units	$ 1,366.80					$ 675.73			$ 675.73			$ 749.10	$ 1,370.23
Repurchase of depository receipts	$ 305,230												$ 179,782
Repurchase of units	271	404		51.56			2.71		114					30.34	1.6
Total cost of repurchase	$ 379,409	$ 399,487	$ 32,860,350	$ 70,470	$ 74,335		$ 3,709	$ 3,912		$ 305,230	$ 321,240			$ 41,568	$ 2,188