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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | $ 11,722 | $ 15,257
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 11,722 | 15,257
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (7,549) | (6,975)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (2,930) | (4,735)
Net Amount | 1,243 | 3,547
Gross Amounts of Recognized Liabilities | (1,778,711) | (1,851,876)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,778,711) | (1,851,876)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,724,930 | 1,800,800
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 53,167 | 50,100
Net Amount | (614) | (976)
Interest Rate Swaps |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 7,781 | 7,006
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 7,781 | 7,006
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (5,651) | (1,160)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (1,917) | (4,360)
Net Amount | 213 | 1,486
Gross Amounts of Recognized Liabilities | (58,366) | (48,173)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (58,366) | (48,173)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 5,651 | 1,160
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 52,715 | 47,013
Net Amount | 0 | 0
Credit default index swaps |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 1,207 | 1,598
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 1,207 | 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 | (720) | (375)
Net Amount | 487 | 1,223
TBAs |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Assets | 2,734 | 6,653
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Assets Presented in Consolidated Balance Sheet | 2,734 | 6,653
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (1,898) | (5,815)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (293) | 0
Net Amount | 543 | 838
Gross Amounts of Recognized Liabilities | (2,519) | (9,506)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (2,519) | (9,506)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,898 | 5,815
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 7 | 2,715
Net Amount | (614) | (976)
Futures |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (445) | (372)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (445) | (372)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 0 | 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 445 | 372
Net Amount | 0 | 0
Loan warehouse debt |  |
Offsetting Asset and Liabilities [Line Items] |  |
Gross Amounts of Recognized Liabilities | (1,023,740) | (1,185,316)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,023,740) | (1,185,316)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,023,740 | 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 | (693,641) | (608,509)
Gross Amounts Offset in Consolidated Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (693,641) | (608,509)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 693,641 | 608,509
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 0 | 0
Net Amount | $ 0 | $ 0

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