TREASURY UNITS (Details)					1 Months Ended	3 Months Ended	9 Months Ended		156 Months Ended	169 Months Ended
	Mar. 09, 2020	Mar. 10, 2015 shares	Aug. 31, 2007 $ / item shares	Aug. 20, 2007 shares	Sep. 30, 2007 $ / item shares	Dec. 31, 2007 $ / item shares	Sep. 30, 2021 $ / item shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 $ / item shares	Sep. 30, 2021 USD ($) $ / item shares	Mar. 06, 2008 shares
Treasury units							58,469			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			585
Fixed distribution percentage of unit holders							1.00%
Number of depository receipts repurchased			188		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			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		852.90
Total cost of repurchase | $								$ 315,220
Class B
Treasury units							11,109			11,109
Fixed distribution percentage of unit holders							19.00%
Number of depository receipts repurchased			3,572		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