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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial liabilities
Other secured financing	$ 861,373	$ 4,455,700	[1]
Carrying Value | Level 2
Financial liabilities
Repurchase agreements	64,633,447	101,740,728
Other secured financing	861,373	4,455,700
Carrying Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,456,459	1,606,091
Corporate debt, held for investment	2,061,878	2,144,850
Financial liabilities
Mortgages payable	507,934	485,005
Fair Value | Level 2
Financial liabilities
Repurchase agreements	64,633,447	101,740,728
Other secured financing	861,373	4,455,700
Fair Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,529,485	1,619,018
Corporate debt, held for investment	2,011,153	2,081,327
Financial liabilities
Mortgages payable	$ 594,242	$ 515,994
[1] Derived from the audited consolidated financial statements at December 31, 2019.

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Fair value of firm holdings in corporate fixed income securities. Includes pledged and unpledged holdings.

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