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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

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