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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial liabilities
Other secured financing	$ 1,538,996	$ 4,455,700	[1]
Carrying Value | Level 2
Financial liabilities
Repurchase agreements	67,163,598	101,740,728
Other secured financing	1,538,996	4,455,700
Carrying Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,493,504	1,606,091
Corporate debt, held for investment	2,185,264	2,144,850
Financial liabilities
Mortgage payable	508,565	485,005
Fair Value | Level 2
Financial liabilities
Repurchase agreements	67,163,598	101,740,728
Other secured financing	1,538,996	4,455,700
Fair Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,567,118	1,619,018
Corporate debt, held for investment	2,114,904	2,081,327
Financial liabilities
Mortgage payable	$ 595,542	$ 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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