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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | $ 50,162 | $ 11,722
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 50,162 | 11,722
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (36,260) | (7,549)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (11,530) | (2,930)
Net Amount | 2,372 | 1,243
Gross Amounts of Recognized Liabilities | (1,177,693) | (1,778,711)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,177,693) | (1,778,711)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,095,304 | 1,724,930
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 82,082 | 53,167
Net Amount | (307) | (614)
Interest rate agreements |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 40,500 | 7,781
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 40,500 | 7,781
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (33,619) | (5,651)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (6,881) | (1,917)
Net Amount | 0 | 213
Gross Amounts of Recognized Liabilities | (108,497) | (58,366)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (108,497) | (58,366)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 33,619 | 5,651
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 74,878 | 52,715
Net Amount | 0 | 0
Credit Default Index Swaps |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets |  | 1,207
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet |  | 1,207
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received |  | (720)
Net Amount |  | 487
TBAs |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 5,584 | 2,734
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 5,584 | 2,734
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (2,641) | (1,898)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (2,200) | (293)
Net Amount | 743 | 543
Gross Amounts of Recognized Liabilities | (10,151) | (2,519)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (10,151) | (2,519)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 2,640 | 1,898
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 7,204 | 7
Net Amount | (307) | (614)
Futures |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 4,078 |
Gross Amounts Offset in Consolidated Balance Sheet | 0 |
Net Amounts of Assets Presented in Consolidated Balance Sheet | 4,078 |
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 |
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (2,449) |
Net Amount | 1,629 |
Gross Amounts of Recognized Liabilities |  | (445)
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  | (445)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged |  | 445
Net Amount |  | 0
Loan warehouse debt |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (706,055) | (1,023,740)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (706,055) | (1,023,740)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 706,055 | 1,023,740
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 | (352,990) | (693,641)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (352,990) | (693,641)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 352,990 | 693,641
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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