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SEGMENT INFORMATION - Schedule of Financial Information of Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues        
Revenues $ 841,618 $ 810,663 $ 1,661,615 $ 1,610,202
Net operating income        
Net operating income 373,970 304,761 762,700 640,589
Other components of net income:        
Management fees and other income 32,042 29,858 62,947 60,006
General and administrative expense (44,952) (39,901) (90,926) (83,623)
Depreciation and amortization expense (177,266) (194,809) (357,622) (391,775)
Gain (loss) on real estate assets held for sale and sold, net (864) (54,659) 34,897 (54,659)
Interest expense (146,128) (137,133) (288,527) (270,020)
Non-cash interest expense related to amortization of discount on unsecured senior notes, net (11,770) (10,853) (23,083) (21,558)
Interest income 41,998 31,226 80,965 54,799
Equity in earnings and dividend income from unconsolidated real estate entities 16,284 17,255 36,215 32,262
Income tax expense (11,638) (9,844) (20,629) (16,586)
Net income 262,716 195,412 547,641 419,486
Operating Segments        
Revenues        
Revenues 809,576 780,805 1,598,668 1,550,196
Operating expenses        
Total segment operating expenses 244,566 216,533 485,264 439,556
Net operating income        
Net operating income 565,010 564,272 1,113,404 1,110,640
Operating Segments | Self-Storage Operations        
Revenues        
Revenues 721,004 697,100 1,425,384 1,385,144
Operating expenses        
Payroll and benefits 45,153 42,282 88,899 85,681
Marketing 18,897 17,763 34,047 34,388
Office expense 36,150 28,886 71,144 58,340
Property operating expense 17,530 16,197 38,755 36,415
Repairs and maintenance 14,282 13,024 30,539 28,235
Property taxes 82,359 66,634 162,243 134,314
Insurance 8,765 8,065 17,197 16,310
Other segment items 4,485 4,051 8,379 7,737
Total segment operating expenses 227,621 196,902 451,203 401,420
Net operating income        
Net operating income 493,383 500,198 974,181 983,724
Operating Segments | Tenant Reinsurance        
Revenues        
Revenues 88,572 83,705 173,284 165,052
Operating expenses        
Other segment items 16,945 19,631 34,061 38,136
Net operating income        
Net operating income $ 71,627 $ 64,074 $ 139,223 $ 126,916