Credit Risk and Interest Rate Risk - Offsetting Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Repurchase Agreements
Gross Amounts of Recognized Assets (Liabilities)	$ (9,127,048)	$ (7,250,452)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(9,127,048)	(7,250,452)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	10,626,383	8,788,680
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	1,156
Net Amount	1,499,335	1,539,384
Derivative Asset
Net Amounts Offset in the Consolidated Statements of Financial Position	129,341	48,914
Derivative Liability
Net Amounts Offset in the Consolidated Statements of Financial Position	0	(320)
Total Liabilities
Gross Amounts of Recognized Assets (Liabilities)	(8,972,297)	(7,201,858)
Gross Amounts Offset in the Consolidated Statements of Financial Position	(25,410)	0
Net Amounts Offset in the Consolidated Statements of Financial Position	(8,997,707)	(7,201,858)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	10,626,383	8,788,680
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	18,184	13,102
Net Amount	1,646,860	1,599,924
Interest Rate Swaps
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	166,115	44,874
Gross Amounts Offset in the Consolidated Statements of Financial Position	(42,140)	(1,617)
Net Amounts Offset in the Consolidated Statements of Financial Position	123,975	43,257
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	16,079	11,570
Net Amount	140,054	54,827
Derivative Liability
Gross Amounts of Recognized Assets (Liabilities)	(16,730)	(1,617)
Gross Amounts Offset in the Consolidated Statements of Financial Position	16,730	1,617
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Treasury Futures
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	2,949	3,552
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	2,949	3,552
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	2,105	376
Net Amount	5,054	3,928
Derivative Liability
Gross Amounts of Recognized Assets (Liabilities)	0	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Swaptions
Derivative Asset
Gross Amounts of Recognized Assets (Liabilities)	2,417	2,105
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	2,417	2,105
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	2,417	2,105
Derivative Liability
Gross Amounts of Recognized Assets (Liabilities)	0	(320)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts Offset in the Consolidated Statements of Financial Position	0	(320)
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset with Financial Assets (Liabilities) in the Consolidated Statements of Financial Position, Cash Collateral (Received) Pledged	0	0
Net Amount	$ 0	$ (320)

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