CONSOLIDATED STATEMENTS OF CASH FLOWS (LP cube) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net income	$ 412,435	$ 292,472	$ 230,813
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	205,379	314,507	240,217
Non-cash portion of interest expense related to finance leases	(44)	(43)	202
Loss on early extinguishment of debt			20,328
Equity in earnings of real estate ventures	(6,085)	(48,877)	(25,275)
Cash distributed from real estate ventures	5,467
Gain on involuntary conversion, net	(4,827)
Gains from sales of real estate, net			(32,698)
Equity compensation expense	10,089	9,081	8,088
Accretion of fair market value adjustment of debt	(886)	(1,099)	(2,037)
Changes in other operating accounts:
Other assets	(10,138)	3,498	(9,247)
Accounts payable and accrued expenses	96	20,395	14,871
Other liabilities	(350)	1,532	3,923
Net cash provided by operating activities	611,136	591,466	449,185
Investing Activities
Acquisitions of storage properties	(22,429)	(89,004)	(151,547)
Acquisition of LAACO, Ltd., net of cash acquired			(1,678,984)
Additions and improvements to storage properties	(39,853)	(41,233)	(34,608)
Development costs	(47,521)	(24,358)	(69,887)
Investment in real estate ventures	(21)	(21)	(28,261)
Cash distributed from real estate ventures	8,344	62,656	66,593
Proceeds from sale of real estate, net	238	43,193	44,026
Proceeds from involuntary conversion, net	7,424
Net cash used in investing activities	(93,818)	(48,767)	(1,852,668)
Proceeds from:
Unsecured senior notes			1,043,427
Revolving credit facility	794,447	633,950	906,571
Principal payments on:
Unsecured senior notes			(300,000)
Revolving credit facility	(837,247)	(782,950)	(814,471)
Mortgage loans and notes payable	(32,591)	(2,426)	(87,263)
Loan procurement costs	(69)	(3,885)	(12,548)
Debt prepayment costs			(20,023)
Acquisition of noncontrolling interest in subsidiary, net			(3,397)
Cash paid upon vesting of restricted OP units	(817)	(1,403)	(876)
Contributions from noncontrolling interests in subsidiaries	1,100	350	8,031
Distributions paid to noncontrolling interests in subsidiaries	(316)	(7,387)	(246)
Distributions paid to common OP unitholders	(442,217)	(387,106)	(273,839)
Net cash (used in) provided by financing activities	(518,026)	(547,092)	1,410,572
Change in cash, cash equivalents and restricted cash	(708)	(4,393)	7,089
Cash, cash equivalents and restricted cash at beginning of period	8,925	13,318	6,229
Cash, cash equivalents and restricted cash at end of period	8,217	8,925	13,318
Supplemental Cash Flow and Noncash Information
Cash paid for interest, net of interest capitalized	95,498	92,293	79,148
Supplemental disclosure of noncash activities:
Acquisitions of storage properties		(700)
Discount on issuance of unsecured senior notes			6,573
Mortgage loan assumptions			40,880
Accretion of put liability		2,444	9,777
Derivative valuation adjustment	81	81	81
Contributions from noncontrolling interests in subsidiaries	7,599	3,340	3,373
CubeSmart, L.P. and Subsidiaries
Operating Activities
Net income	412,435	292,472	230,813
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	205,379	314,507	240,217
Non-cash portion of interest expense related to finance leases	(44)	(43)	202
Loss on early extinguishment of debt			20,328
Equity in earnings of real estate ventures	(6,085)	(48,877)	(25,275)
Cash distributed from real estate ventures	5,467
Gain on involuntary conversion, net	(4,827)
Gains from sales of real estate, net			(32,698)
Equity compensation expense	10,089	9,081	8,088
Accretion of fair market value adjustment of debt	(886)	(1,099)	(2,037)
Changes in other operating accounts:
Other assets	(10,138)	3,498	(9,247)
Accounts payable and accrued expenses	96	20,395	14,871
Other liabilities	(350)	1,532	3,923
Net cash provided by operating activities	611,136	591,466	449,185
Investing Activities
Acquisitions of storage properties	(22,429)	(89,004)	(151,547)
Acquisition of LAACO, Ltd., net of cash acquired			(1,678,984)
Additions and improvements to storage properties	(39,853)	(41,233)	(34,608)
Development costs	(47,521)	(24,358)	(69,887)
Investment in real estate ventures	(21)	(21)	(28,261)
Cash distributed from real estate ventures	8,344	62,656	66,593
Proceeds from sale of real estate, net	238	43,193	44,026
Proceeds from involuntary conversion, net	7,424
Net cash used in investing activities	(93,818)	(48,767)	(1,852,668)
Proceeds from:
Unsecured senior notes			1,043,427
Revolving credit facility	794,447	633,950	906,571
Principal payments on:
Unsecured senior notes			(300,000)
Revolving credit facility	(837,247)	(782,950)	(814,471)
Mortgage loans and notes payable	(32,591)	(2,426)	(87,263)
Loan procurement costs	(69)	(3,885)	(12,548)
Debt prepayment costs			(20,023)
Acquisition of noncontrolling interest in subsidiary, net			(3,397)
Issuance of common OP units, net	(276)	4,877	965,638
Cash paid upon vesting of restricted OP units	(817)	(1,403)	(876)
Exercise of OP unit options	2,716	1,590	7,865
Contributions from noncontrolling interests in subsidiaries	1,100	350	8,031
Distributions paid to noncontrolling interests in subsidiaries	(316)	(7,387)	(246)
Distributions paid to common OP unitholders	(444,973)	(389,808)	(282,136)
Net cash (used in) provided by financing activities	(518,026)	(547,092)	1,410,572
Change in cash, cash equivalents and restricted cash	(708)	(4,393)	7,089
Cash, cash equivalents and restricted cash at beginning of period	8,925	13,318	6,229
Cash, cash equivalents and restricted cash at end of period	8,217	8,925	13,318
Supplemental Cash Flow and Noncash Information
Cash paid for interest, net of interest capitalized	95,498	92,293	79,148
Supplemental disclosure of noncash activities:
Acquisitions of storage properties		(700)
Discount on issuance of unsecured senior notes			6,573
Mortgage loan assumptions			40,880
Accretion of put liability		2,444	9,777
Derivative valuation adjustment	(81)	(81)	(81)
Contributions from noncontrolling interests in subsidiaries	$ 7,599	$ 3,340	$ 3,373