FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	$ 2,980,188	$ 3,182,614
Net Book Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,194,079	3,370,877
Total financial liabilities	2,980,188	3,182,614
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	3,247,585	3,430,270
Total financial liabilities	2,927,052	3,098,368
Level 2 and Level 3 \| Liquid corporate senior loans \| Net Book Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	24,204	35,653
Level 2 and Level 3 \| Liquid corporate senior loans \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	21,186	32,062
Level 2 \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	17,000
Level 2 \| Fair Value \| Syndicated Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		26,000
Level 2 \| Repurchase facilities, notes payable and credit facilities \| Net Book Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	2,980,188	3,182,614
Level 2 \| Repurchase facilities, notes payable and credit facilities \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial liabilities	2,927,052	3,098,368
Level 3 \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	4,200
Level 3 \| Fair Value \| Syndicated Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets		6,100
Level 3 \| First Mortgage Loans \| Net Book Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	2,838,179	3,085,104
Level 3 \| First Mortgage Loans \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	2,890,687	3,141,665
Level 3 \| Corporate senior loans \| Net Book Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	331,696	250,120
Level 3 \| Corporate senior loans \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 335,712	$ 256,543

CIM REAL ESTATE FINANCE TRUST, INC. 10-Q