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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial liabilities |  |  |
Other secured financing | $ 1,805,428 | $ 4,455,700 | [1]
Carrying Value | Level 1 |  |  |
Financial assets |  |  |
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 72,580,183 | 101,740,728 |
Financial liabilities |  |  |
Other secured financing | 1,805,428 | 4,455,700 |
Carrying Value | Level 2 |  |  |
Financial assets |  |  |
Corporate debt, held for investment | 2,150,263 | 2,144,850 |
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 72,580,183 | 101,740,728 |
Financial liabilities |  |  |
Other secured financing | 1,805,428 | 4,455,700 |
Carrying Value | Level 3 |  |  |
Financial assets |  |  |
Commercial real estate debt and preferred equity, held for investment | 1,563,134 | 1,606,091 |
Corporate debt, held for investment | 2,150,263 | 2,144,850 |
Financial liabilities |  |  |
Mortgage payable | 484,762 | 485,005 |
Fair Value | Level 1 |  |  |
Financial assets |  |  |
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 72,580,183 | 101,740,728 |
Financial liabilities |  |  |
Other secured financing | 1,805,428 | 4,455,700 |
Fair Value | Level 2 |  |  |
Financial assets |  |  |
Corporate debt, held for investment | 1,965,186 | 2,081,327 |
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 72,580,183 | 101,740,728 |
Financial liabilities |  |  |
Other secured financing | 1,805,428 | 4,455,700 |
Fair Value | Level 3 |  |  |
Financial assets |  |  |
Commercial real estate debt and preferred equity, held for investment | 1,589,752 | 1,619,018 |
Corporate debt, held for investment | 1,969,399 | 2,081,327 |
Financial liabilities |  |  |
Mortgage payable | $ 574,648 | $ 515,994 |
[1] | Derived from the audited consolidated financial statements at December 31, 2019.

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