SEGMENT INFORMATION - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues
Rental income	$ 386,250	$ 376,306	$ 1,137,198	$ 1,123,338
Income from loans and investments	5,524	1,881	14,243	4,606
Interest and other income	4,184	8,204	13,133	19,809
Revenues	1,488,996	1,236,315	4,267,963	3,637,209
Less:
Interest and other income	4,184	8,204	13,133	19,809
Labor	442,551	354,505	1,255,387	1,042,311
Management fees	56,978	43,105	162,010	127,122
Other segment expenses	368,869	315,798	1,060,154	911,623
Property-level operating expenses	868,398	713,408	2,477,551	2,081,056
Third-party capital management expenses			4,969	4,956
NOI	614,897	513,150	1,772,310	1,531,388
Interest and other income	4,184	8,204	13,133	19,809
Interest expense	(158,124)	(150,437)	(457,778)	(449,629)
Depreciation and amortization	(357,173)	(304,268)	(1,026,417)	(944,371)
General, administrative and professional fees	(40,387)	(35,092)	(136,392)	(121,556)
Loss on extinguishment of debt, net	(119)	0	(119)	(672)
Transaction, transition and restructuring costs	(5,472)	(8,580)	(16,081)	(16,143)
Other expense	(13,370)	(3,935)	(20,621)	(10,729)
Recovery of allowance on loans receivable and investments, net		56		166
Shareholder relations matters	0	0	0	(15,751)
Income (loss) from unconsolidated entities	16,644	4,629	12,195	(5,406)
Gain on real estate dispositions	1,283	271	35,268	50,282
Income tax expense (benefit)	(6,345)	3,002	(13,028)	7,764
Net income	68,708	20,996	188,526	29,624
Net income attributable to noncontrolling interests	2,661	1,753	7,347	5,306
Net income attributable to common stockholders	66,047	19,243	181,179	24,318
Resident fees and services
Revenues
Resident fees and services	1,088,546	845,532	3,090,164	2,476,436
Third-party capital management expenses
Revenues
Other revenues	4,492	4,392	13,225	13,020
Less:
Third-party capital management expenses	1,517	1,553	4,969	4,956
Operating Segments | SHOP
Revenues
Rental income	0	0	0	0
Income from loans and investments	0	0	0	0
Interest and other income	0	0	0	0
Revenues	1,088,546	845,532	3,090,164	2,476,436
Less:
Interest and other income	0	0	0	0
Labor	442,551	354,505	1,255,387	1,042,311
Management fees	56,978	43,105	162,010	127,122
Other segment expenses	286,721	233,940	819,555	675,297
Property-level operating expenses	786,250	631,550	2,236,952	1,844,730
Third-party capital management expenses			0	0
NOI	302,296	213,982	853,212	631,706
Interest and other income	0	0	0	0
Operating Segments | SHOP | Resident fees and services
Revenues
Resident fees and services	1,088,546	845,532	3,090,164	2,476,436
Operating Segments | SHOP | Third-party capital management expenses
Revenues
Other revenues	0	0	0	0
Less:
Third-party capital management expenses	0	0
Operating Segments | OM&R
Revenues
Rental income	226,200	220,957	668,333	658,687
Income from loans and investments	0	0	0	0
Interest and other income	0	0	0	0
Revenues	226,881	221,575	670,367	660,641
Less:
Interest and other income	0	0	0	0
Labor	0	0	0	0
Management fees	0	0	0	0
Other segment expenses	79,136	77,479	230,094	224,703
Property-level operating expenses	79,136	77,479	230,094	224,703
Third-party capital management expenses			0	0
NOI	147,745	144,096	440,273	435,938
Interest and other income	0	0	0	0
Operating Segments | OM&R | Resident fees and services
Revenues
Resident fees and services	0	0	0	0
Operating Segments | OM&R | Third-party capital management expenses
Revenues
Other revenues	681	618	2,034	1,954
Less:
Third-party capital management expenses	0	0
Operating Segments | NNN
Revenues
Rental income	160,050	155,349	468,865	464,651
Income from loans and investments	0	0	0	0
Interest and other income	0	0	0	0
Revenues	160,050	155,349	468,865	464,651
Less:
Interest and other income	0	0	0	0
Labor	0	0	0	0
Management fees	0	0	0	0
Other segment expenses	3,012	4,379	10,505	11,623
Property-level operating expenses	3,012	4,379	10,505	11,623
Third-party capital management expenses			0	0
NOI	157,038	150,970	458,360	453,028
Interest and other income	0	0	0	0
Operating Segments | NNN | Resident fees and services
Revenues
Resident fees and services	0	0	0	0
Operating Segments | NNN | Third-party capital management expenses
Revenues
Other revenues	0	0	0	0
Less:
Third-party capital management expenses	0	0
Non-Segment
Revenues
Rental income	0	0	0	0
Income from loans and investments	5,524	1,881	14,243	4,606
Interest and other income	4,184	8,204	13,133	19,809
Revenues	13,519	13,859	38,567	35,481
Less:
Interest and other income	4,184	8,204	13,133	19,809
Labor	0	0	0	0
Management fees	0	0	0	0
Other segment expenses	0	0	0	0
Property-level operating expenses	0	0	0	0
Third-party capital management expenses				4,956
NOI	7,818	4,102	20,465	10,716
Interest and other income	4,184	8,204	13,133	19,809
Non-Segment | Resident fees and services
Revenues
Resident fees and services	0	0	0	0
Non-Segment | Third-party capital management expenses
Revenues
Other revenues	3,811	3,774	11,191	$ 11,066
Less:
Third-party capital management expenses	$ 1,517	$ 1,553	$ 4,969