v3.25.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
item
entity
facility
$ / shares
shares
Dec. 31, 2024
USD ($)
entity
$ / shares
Dec. 31, 2023
USD ($)
Dec. 12, 2025
CAD ($)
Jul. 31, 2025
facility
Apr. 30, 2021
USD ($)
Accounting Policies [Line Items]            
Impairment on real estate properties $ 22,610,000 $ 23,831,000 $ 91,943,000      
Cash, FDIC insured amount 250,000          
Accrued expenses and other liabilities 352,549,000 328,193,000        
Impairment of goodwill $ 0 0 0      
Number of operating segments 1          
Number of reportable segment 1          
Amortization of financing cost $ 6,000,000 $ 10,400,000 13,700,000      
Common stock, par value (in dollars per share) | $ / shares $ 0.1 $ 0.1        
Number of units tendered for redemption of unregistered shares | shares 1          
Net cash provided by (used in) operating activities $ 878,551,000 $ 749,430,000 617,736,000      
Increase in cash, cash equivalents, and restricted cash (494,172,000) 104,005,000 144,086,000      
Right of use assets 27,283,000 28,302,000        
Lease liabilities 29,512,000 30,328,000        
Real estate tax expense $ 14,438,000 14,561,000 15,025,000      
Financing Receivable, Practical Expedient, Accrued Interest Exclusion [true false] true          
Accrued investment income receivable $ 9,700,000 11,100,000        
Interest receivable $ 2,363,000 1,839,000        
Number of operators | item 89          
Capitalized interest $ 1,100,000 7,300,000 4,300,000      
Revenues 1,190,099,000 1,051,390,000 949,740,000      
Assets held for sale $ 4,000,000 $ 56,194,000        
Number of joint venture variable interest entities consolidated | entity 1 1        
Number of Facilities | facility 1,027          
Contractual obligation $ 336,045,000          
United Kingdom | Subsidiaries [Member]            
Accounting Policies [Line Items]            
Long lived assets and goodwill 1,600,000,000 $ 1,100,000        
Revenues 180,100,000 93,600,000 $ 56,800,000      
Unsecured Debt [Member] | Revolving Credit Facility            
Accounting Policies [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,450,000,000
Omega OP Term Loan Facility | Unsecured Debt [Member]            
Accounting Policies [Line Items]            
Term loans - net   50,000,000       $ 50,000,000
Lease and Mortgage Liquidity and Other Deposits [Member]            
Accounting Policies [Line Items]            
Security deposit 22,900,000 15,500,000        
Lease and Mortgage Security Deposits [Member]            
Accounting Policies [Line Items]            
Security deposit 80,800,000 52,700,000        
Lease and Mortgage Letter of Credit [Member]            
Accounting Policies [Line Items]            
Security deposit $ 24,200,000 29,100,000        
Minimum [Member]            
Accounting Policies [Line Items]            
Lessor, operating lease, term of contract 5 years          
Period specified for rental and mortgage interest 3 months          
Maximum [Member]            
Accounting Policies [Line Items]            
Lessor, operating lease, term of contract 15 years          
Period specified for rental and mortgage interest 6 months          
Other Real Estate Loans [Member]            
Accounting Policies [Line Items]            
Financing receivable, allowance for credit losses $ 41,538,000 31,687,000        
Contractual obligation $ 90,891,000          
Other Real Estate Loans [Member] | CANADA            
Accounting Policies [Line Items]            
Contractual obligation       $ 87.6    
Cash Flow Hedging [Member] | Other Assets [Member]            
Accounting Policies [Line Items]            
Cash flow hedges recorded at fair value, asset   $ 381,000        
Genesis Healthcare [Member]            
Accounting Policies [Line Items]            
Number of Facilities | facility         31  
Site Improvements And Equipment [Member] | Minimum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 8 years          
Site Improvements And Equipment [Member] | Maximum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 15 years          
Furniture, fixtures and equipment | Minimum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 3 years          
Furniture, fixtures and equipment | Maximum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 10 years          
Building [Member] | Minimum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 20 years          
Building [Member] | Maximum [Member]            
Accounting Policies [Line Items]            
Estimated useful lives 40 years