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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial assets
Assets transferred or pledged to securitization vehicles	$ 4,073,156	$ 6,910,020	[1]
Corporate debt, held for sale	69,032,335	75,652,396
Financial liabilities
Other secured financing	909,655	917,876	[1]
Carrying Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	0	1,372,430
Corporate debt, held for investment	2,066,709	2,239,930
Financial liabilities
Mortgages payable	0	426,256
Carrying Value | Level 3 | Corporate Loans
Financial assets
Corporate debt, held for sale	466,370	0
Carrying Value | Level 2
Financial assets
Assets transferred or pledged to securitization vehicles	0	874,349
Financial liabilities
Repurchase agreements	60,221,067	64,825,239
Other secured financing	909,655	917,876
Fair Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	0	1,442,071
Corporate debt, held for investment	2,080,002	2,226,045
Financial liabilities
Mortgages payable	0	474,779
Fair Value | Level 3 | Corporate Loans
Financial assets
Corporate debt, held for sale	466,370	0
Fair Value | Level 2
Financial assets
Assets transferred or pledged to securitization vehicles	0	928,732
Financial liabilities
Repurchase agreements	60,221,067	64,825,239
Other secured financing	$ 909,655	$ 917,876
[1] Derived from the audited consolidated financial statements at December 31, 2020.

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