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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial liabilities    
Other secured financing $ 4,455,700 $ 4,183,311
Carrying Value | Level 2    
Financial assets    
Corporate debt held for investment 2,144,850 1,887,182
Carrying Value | Level 3    
Financial assets    
Commercial real estate debt and preferred equity, held for investment (1) 1,606,091 1,296,803
Commercial loans held for sale, net 0 42,184
Financial liabilities    
Mortgage payable 485,005 511,056
Carrying Value | Level 1 and 2    
Financial liabilities    
Repurchase agreements 101,740,728 81,115,874
Other secured financing 4,455,700 4,183,311
Fair Value | Level 2    
Financial assets    
Corporate debt held for investment 2,081,327 1,863,524
Fair Value | Level 3    
Financial assets    
Commercial real estate debt and preferred equity, held for investment (1) 1,619,018 1,303,487
Commercial loans held for sale, net 0 42,184
Financial liabilities    
Mortgage payable 515,994 507,770
Fair Value | Level 1 and 2    
Financial liabilities    
Repurchase agreements 101,740,728 81,115,874
Other secured financing $ 4,455,700 $ 4,183,805