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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | $ 20,436 | $ 15,257
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 20,436 | 15,257
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (8,294) | (6,975)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (6,385) | (4,735)
Net Amount | 5,757 | 3,547
Gross Amounts of Recognized Liabilities | (1,416,770) | (1,851,876)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,416,770) | (1,851,876)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,375,356 | 1,800,800
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 40,618 | 50,100
Net Amount | (796) | (976)
Interest rate agreements |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 9,017 | 7,006
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 9,017 | 7,006
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (3,555) | (1,160)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (4,822) | (4,360)
Net Amount | 640 | 1,486
Gross Amounts of Recognized Liabilities | (43,982) | (48,173)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (43,982) | (48,173)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 3,555 | 1,160
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 40,018 | 47,013
Net Amount | (409) | 0
Credit Default Index Swaps |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 3,792 | 1,598
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 3,792 | 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 | 3,792 | 1,223
TBAs |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 7,627 | 6,653
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 7,627 | 6,653
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (4,739) | (5,815)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (1,563) | 0
Net Amount | 1,325 | 838
Gross Amounts of Recognized Liabilities | (5,466) | (9,506)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (5,466) | (9,506)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 4,739 | 5,815
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 340 | 2,715
Net Amount | (387) | (976)
Futures |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (260) | (372)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (260) | (372)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 260 | 372
Net Amount | 0 | 0
Loan warehouse debt |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (873,673) | (1,185,316)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (873,673) | (1,185,316)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 873,673 | 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 | (493,389) | (608,509)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (493,389) | (608,509)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 493,389 | 608,509
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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