Offsetting Assets and Liabilities - Offsetting of Derivative Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives Asset
Gross Amounts of Recognized Assets (Liabilities)	$ 3,137
Gross Amounts Offset in the Balance Sheets	0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets	3,137
Financial Instruments	(391)
Cash Collateral (Received) Pledged	(168)
Net Amount	2,578
Total Assets
Gross Amounts of Recognized Assets (Liabilities)	3,137
Gross Amounts Offset in the Balance Sheets	0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets	3,137
Financial Instruments	(391)
Cash Collateral (Received) Pledged	(168)
Net Amount	2,578
Derivatives Liability
Gross Amounts of Recognized Assets (Liabilities)	(391)	$ (352)
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets	(391)	(352)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	391	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	0	320
Net Amount	0	(32)
Repurchase Agreements
Gross Amounts of Recognized Assets (Liabilities)	(5,243,288)	(17,532,303)
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets	(5,243,288)	(17,532,303)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	5,243,288	17,532,303
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	0	0
Net Amount	0	0
Secured Loans
Gross Amounts of Recognized Assets (Liabilities)		(1,650,000)
Gross Amounts Offset in the Balance Sheets		0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets		(1,650,000)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments		1,650,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted		0
Net Amount		0
Total Borrowings
Gross Amounts of Recognized Assets (Liabilities)	(5,243,679)	(19,182,655)
Gross Amounts Offset in the Balance Sheets	0	0
Net Amounts of Assets (Liabilities) Presented in the Balance Sheets	(5,243,679)	(19,182,655)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	5,243,679	19,182,303
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	0	320
Net Amount	0	(32)
Cash, collateral held	950	170
Fair value of securities pledged under repurchase agreements, excluding cash collateral	5,500,000	19,100,000
Collateral pledged against secured loans	0	1,898,489
Repurchase agreement
Total Borrowings
Cash collateral pledged	3,105	32,600
Cash, collateral held	670	10
Restricted cash
Total Borrowings
Collateral pledged against secured loans	0	600
IAS Services LLC
Total Borrowings
Collateral pledged against secured loans		1,900,000
Centrally Cleared Swaps
Total Borrowings
Securities pledged as collateral, fair value		189,800
Currency Forward Contracts and Centrally Cleared Interest Rate Swaps
Total Borrowings
Cash collateral pledged	167,400	116,400
Interest Rate Swaps
Total Borrowings
Cash, collateral held	$ 280	$ 160

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