v3.26.1
Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Revenue $ 1,232,881 $ 1,201,094 $ 2,450,622 $ 2,384,278
Operating income 466,681 499,999 940,959 964,005
Depreciation and amortization (287,757) (283,216) (578,480) (565,931)
Real estate acquisition and development expense (5,187) (2,538) (7,615) (9,961)
General and administrative (44,369) (25,727) (74,720) (50,911)
Interest and other income (expense) 16,877 12,789 24,655 26,023
Interest expense (84,781) (71,609) (164,799) (143,618)
Equity in earnings (loss) of unconsolidated real estate entity 4,944 (2,230) 11,780 1,397
Foreign currency exchange gain (loss) 17,187 (146,070) 58,860 (214,765)
Gain (Loss) on sale of real estate (35) 163 344 208
Income tax (provision) benefit (2,716) (3,240) (4,285) (4,666)
Net income 502,938 361,411 1,032,313 772,202
Segment Reconciling Items        
Segment Reporting [Line Items]        
Real estate acquisition and development expense (5,187) (2,538) (7,615) (9,961)
General and administrative (44,369) (25,727) (74,720) (50,911)
Interest and other income (expense) 16,877 12,789 24,655 26,023
Interest expense (84,781) (71,609) (164,799) (143,618)
Equity in earnings (loss) of unconsolidated real estate entity 4,944 (2,230) 11,780 1,397
Foreign currency exchange gain (loss) 17,187 (146,070) 58,860 (214,765)
Gain (Loss) on sale of real estate (35) 163 344 208
Income tax (provision) benefit (2,716) (3,240) (4,285) (4,666)
Self-Storage Operations Reportable Segment | Operating Segments        
Segment Reporting [Line Items]        
Revenue 1,139,947 1,118,658 2,268,072 2,221,656
Cost of operations: (307,820) (284,717) (613,499) (585,871)
Indirect cost of operations (37,995) (34,905) (75,446) (70,424)
Operating income 832,127 833,941 1,654,573 1,635,785
Depreciation and amortization (287,757) (283,216) (578,480) (565,931)
Net income 544,370 550,725 1,076,093 1,069,854
Self-Storage Operations Reportable Segment | Operating Segments | Property taxes        
Segment Reporting [Line Items]        
Cost of operations: (133,117) (120,308) (257,396) (243,210)
Self-Storage Operations Reportable Segment | Operating Segments | On-site property manager payroll        
Segment Reporting [Line Items]        
Cost of operations: (39,936) (39,448) (80,465) (79,083)
Self-Storage Operations Reportable Segment | Operating Segments | Repairs and maintenance        
Segment Reporting [Line Items]        
Cost of operations: (24,414) (22,984) (50,779) (49,894)
Self-Storage Operations Reportable Segment | Operating Segments | Utilities        
Segment Reporting [Line Items]        
Cost of operations: (14,505) (13,493) (33,034) (32,218)
Self-Storage Operations Reportable Segment | Operating Segments | Marketing        
Segment Reporting [Line Items]        
Cost of operations: (25,954) (23,890) (52,296) (50,660)
Self-Storage Operations Reportable Segment | Operating Segments | Other direct property costs        
Segment Reporting [Line Items]        
Cost of operations: (31,899) (29,689) (64,083) (60,382)
Ancillary Operations | Operating Segments        
Segment Reporting [Line Items]        
Revenue 92,934 82,436 182,550 162,622
Operating income 56,648 49,148 112,000 98,641
Cost of operations (36,286) (33,288) (70,550) (63,981)
Net income $ 601,018 $ 599,873 $ 1,188,093 $ 1,168,495