TREASURY UNITS (Details)					1 Months Ended	3 Months Ended		6 Months Ended			132 Months Ended	142 Months Ended
	Mar. 09, 2020	Mar. 10, 2015 shares	Aug. 31, 2007 $ / item shares	Aug. 20, 2007 shares	Sep. 30, 2007 $ / item shares	Mar. 31, 2019 $ / item shares	Dec. 31, 2007 $ / item shares	Jun. 30, 2021 shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 $ / item shares	Dec. 31, 2018 $ / item shares	Jun. 30, 2019 USD ($) $ / item	Mar. 06, 2008 shares
Treasury units								58,469
Period for repurchase of depository receipts	5 years	5 years		12 months
Depository receipts authorized to be repurchased		2,000,000		300,000									1,500,000
Number of depository receipts repurchased			1,428,437		1,428,437		1,428,437			1,428,437	1,428,437
Repurchase price of depository receipts (in dollars per receipt) | $ / item												28.43
Units required to be repurchased (in shares)									222
Total cost of repurchase | $									$ 394,031			$ 44,718,000
General Partnership
Treasury units								585
Fixed distribution percentage of unit holders								1.00%
Number of depository receipts repurchased			188		188	188					188
Total cost of repurchase | $									$ 3,941
Treasury Units
Units required to be repurchased (in shares)									222
Class A
Treasury units								46,775
Fixed distribution percentage of unit holders								80.00%
Repurchase price of units (in dollars per unit) | $ / item			852.90		852.90	852.90					852.90
Total cost of repurchase | $									$ 315,220
Class B
Treasury units								11,109
Fixed distribution percentage of unit holders								19.00%
Number of depository receipts repurchased			3,572		3,572	3,572					3,572
Total cost of repurchase | $									$ 74,870
Class B | General Partnership
Repurchase price of units (in dollars per unit) | $ / item			1,033.00		1,033.00		1,033.00			1,033.00	1,033.00