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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financial assets    
Assets transferred or pledged to securitization vehicles $ 7,809,307 $ 6,086,308 [1]
Financial liabilities    
Other secured financing 914,255 903,255 [1]
Carrying Value | Level 3    
Financial assets    
Corporate debt, held for investment 1,967,667 1,968,991
Carrying Value | Level 2    
Financial liabilities    
Repurchase agreements 52,626,503 54,769,643
Other secured financing 914,255 903,255
Fair Value | Level 3    
Financial assets    
Corporate debt, held for investment 1,998,487 1,986,379
Fair Value | Level 2    
Financial liabilities    
Repurchase agreements 52,626,503 54,769,643
Other secured financing $ 914,255 $ 903,255
[1] (1)Derived from the audited consolidated financial statements at December 31, 2021.