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FAIR VALUE MEASUREMENTS - Estimated Fair Values for All Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial liabilities
Other secured financing	$ 4,466,030	$ 4,183,311	[1]
Carrying Value | Level 1
Financial liabilities
Repurchase agreements	105,181,241	81,115,874
Other secured financing	4,127,989	4,183,311
Carrying Value | Level 2
Financial assets
Corporate debt, held for investment	2,115,783	1,887,182
Financial liabilities
Repurchase agreements	102,682,104	81,115,874
Other secured financing	4,466,030	4,183,311
Carrying Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,421,434	1,296,803
Commercial loans held for sale, net	0	42,184
Financial liabilities
Mortgage payable	485,657	511,056
Fair Value | Level 1
Financial liabilities
Repurchase agreements	105,181,241	81,115,874
Other secured financing	4,128,155	4,183,805
Fair Value | Level 2
Financial assets
Corporate debt, held for investment	2,073,721	1,863,524
Financial liabilities
Repurchase agreements	102,682,104	81,115,874
Other secured financing	4,466,210	4,183,805
Fair Value | Level 3
Financial assets
Commercial real estate debt and preferred equity, held for investment	1,434,293	1,303,487
Commercial loans held for sale, net	0	42,184
Financial liabilities
Mortgage payable	$ 529,198	$ 507,770
[1] (1)  Derived from the audited consolidated financial statements at December 31, 2018.

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

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Secured financing other than securities sold under agreements to repurchase and securities loaned.

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