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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | $ 27,031 | $ 11,722
Gross Amounts Offset in Consolidated Balance Sheet |  | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 27,031 | 11,722
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (20,265) | (7,549)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (4,581) | (2,930)
Net Amount | 2,185 | 1,243
Gross Amounts of Recognized Liabilities | (901,338) | (1,778,711)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (901,338) | (1,778,711)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 824,440 | 1,724,930
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 76,178 | 53,167
Net Amount | (720) | (614)
Interest rate agreements |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 24,188 | 7,781
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 24,188 | 7,781
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (18,926) | (5,651)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (4,581) | (1,917)
Net Amount | 681 | 213
Gross Amounts of Recognized Liabilities | (92,100) | (58,366)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (92,100) | (58,366)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 18,926 | 5,651
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 73,174 | 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 | 2,843 | 2,734
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 2,843 | 2,734
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (1,339) | (1,898)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | 0 | (293)
Net Amount | 1,504 | 543
Gross Amounts of Recognized Liabilities | (3,739) | (2,519)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (3,739) | (2,519)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,339 | 1,898
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 1,680 | 7
Net Amount | (720) | (614)
Futures |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (1,324) | (445)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,324) | (445)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 1,324 | 445
Net Amount | 0 | 0
Loan warehouse debt |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (368,679) | (1,023,740)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (368,679) | (1,023,740)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 368,679 | 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 | (435,496) | (693,641)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (435,496) | (693,641)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 435,496 | 693,641
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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