Offsetting Assets and Liabilities - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives Liability
Gross Amounts of Recognized Liabilities	$ 8,204	$ 22,445
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Liabilities presented in the Condensed Consolidated Balance Sheets	8,204	22,445
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(6,387)	(21,169)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	(1,691)	(620)
Net Amount	126	656
Repurchase Agreements
Gross Amounts of Recognized Liabilities	13,911,137	14,080,801
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Liabilities presented in the Condensed Consolidated Balance Sheets	13,911,137	14,080,801
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(13,911,137)	(14,080,801)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	0	0
Net Amount	0	0
Secured Loans
Gross Amounts of Recognized Liabilities	1,650,000	1,650,000
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Liabilities presented in the Condensed Consolidated Balance Sheets	1,650,000	1,650,000
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(1,650,000)	(1,650,000)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	0	0
Net Amount	0	0
Total Borrowings
Gross Amounts of Recognized Liabilities	15,569,341	15,753,246
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts of Liabilities presented in the Condensed Consolidated Balance Sheets	15,569,341	15,753,246
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	(15,567,524)	(15,751,970)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Posted	(1,691)	(620)
Net Amount	126	656
Interest rate swaps collateral pledged	89,700	109,900
Cash collateral posted by Company's derivative counterparties	27,553	7,327
Due from counterparties	5,800	620
Fair value of securities pledged under repurchase agreement	15,368,586	15,523,415
Collateral pledged against secured loans	1,918,895	$ 1,927,496
Cash collateral pledged on secured loans	2,000
IAS Services LLC
Total Borrowings
Collateral pledged against secured loans	$ 1,900,000

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Derivative Liability, Excluding Portion Related to Centrally Cleared Interest Rate Swaps

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