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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | $ 28,490 | $ 15,257
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 28,490 | 15,257
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (18,591) | (6,975)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (6,856) | (4,735)
Net Amount | 3,043 | 3,547
Gross Amounts of Recognized Liabilities | (1,834,701) | (1,851,876)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,834,701) | (1,851,876)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,765,695 | 1,800,800
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 63,989 | 50,100
Net Amount | (5,017) | (976)
Interest rate agreements |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 16,788 | 7,006
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 16,788 | 7,006
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (9,932) | (1,160)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (6,856) | (4,360)
Net Amount | 0 | 1,486
Gross Amounts of Recognized Liabilities | (72,415) | (48,173)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (72,415) | (48,173)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 9,932 | 1,160
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 59,933 | 47,013
Net Amount | (2,550) | 0
Credit Default Index Swaps |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 2,792 | 1,598
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 2,792 | 1,598
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | 0 | (375)
Net Amount | 2,792 | 1,223
TBAs |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 8,910 | 6,653
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 8,910 | 6,653
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (8,659) | (5,815)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | 0 | 0
Net Amount | 251 | 838
Gross Amounts of Recognized Liabilities | (14,994) | (9,506)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (14,994) | (9,506)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 8,659 | 5,815
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 3,868 | 2,715
Net Amount | (2,467) | (976)
Futures |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (188) | (372)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (188) | (372)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 188 | 372
Net Amount | 0 | 0
Loan warehouse debt |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (1,271,610) | (1,185,316)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,271,610) | (1,185,316)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,271,610 | 1,185,316
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount |  | 0
Security repurchase agreements |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (475,494) | (608,509)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (475,494) | (608,509)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 475,494 | 608,509
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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