SUBSEQUENT EVENTS (Details)	1 Months Ended	2 Months Ended	12 Months Ended			172 Months Ended
	Jan. 31, 2022 $ / item	Mar. 09, 2022 USD ($) $ / item shares	Dec. 31, 2021 USD ($) $ / item shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2021 USD ($) $ / item shares
Subsequent events
Number of depository receipts repurchased | shares						1,434,189
Repurchase price of depository receipts (in dollars per receipt)						28.31
Total cost of repurchase | $			$ 450,258	$ 394,031	$ 4,050,137	$ 45,168,000
Units required to be repurchased (in shares) | shares			240	222	2,408
Subsequent event
Subsequent events
Number of depository receipts repurchased | shares		5,832
Repurchase price of depository receipts (in dollars per receipt)		69.94
Price per unit of depository receipts		2,098.20
Total cost of repurchase | $		$ 408,024
Quarterly distribution per unit approved (in dollars per unit)	9.60
Quarterly distribution per unit (in dollars per unit)	0.32
Special distribution per depository receipt (in dollars per receipt)	1.28
Special distribution per unit (in dollars per unit)	38.40
Class B
Subsequent events
Total cost of repurchase | $			$ 85,492	$ 74,870	$ 769,458
Units required to be repurchased (in shares) | shares			45.54
Class B | Subsequent event
Subsequent events
Units required to be repurchased (in shares) | shares		46
Value of units required to be repurchased | $		$ 96,264
General Partnership
Subsequent events
Number of depository receipts repurchased | shares						191
Total cost of repurchase | $			$ 4,500	3,941	40,498
Units required to be repurchased (in shares) | shares			2.40
General Partnership | Subsequent event
Subsequent events
Units required to be repurchased (in shares) | shares		2
Value of units required to be repurchased | $		$ 4,344
Class A
Subsequent events
Number of depository receipts repurchased | shares			5,752
Repurchase price of depository receipts (in dollars per receipt)			62.58
Total cost of repurchase | $			$ 360,266	$ 315,220	$ 3,240,181
Class A | Subsequent event
Subsequent events
Special distribution per depository receipt (in dollars per receipt)	1.28
Special distribution per unit (in dollars per unit)	38.40