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Offsetting of Financial Assets, Liabilities, and Collateral (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | $ 6,760 | [1] | $ 7,704 | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet | 6,760 | [1] | 7,704 | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (2,517) | [1],[2] | (6,058) | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (1,525) | [1],[2] | (482) | [1],[2]
Net Amount | 2,718 | [1] | 1,164 | [1]
Gross Amounts of Recognized Liabilities | (1,925,846) | [1] | (930,018) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,925,846) | [1] | (930,018) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,890,205 | [1],[2] | 918,288 | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 35,094 | [1],[2] | 11,730 | [1],[2]
Net Amount | (547) | [1] |  | [1]
Interest Rate Swaps |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 2,892 | [1] | 6,566 | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet | 2,892 | [1] | 6,566 | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (1,033) | [1],[2] | (5,402) | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (1,150) | [1],[2] |  |
Net Amount | 709 | [1] | 1,164 | [1]
Gross Amounts of Recognized Liabilities | (34,449) | [1] | (16,599) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (34,449) | [1] | (16,599) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,033 | [1],[2] | 5,402 | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 33,416 | [1],[2] | 11,197 | [1],[2]
Net Amount |  |  |  | [1]
Credit Default Index Swaps |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 2,372 | [1] |  |
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  |
Net Amounts of Assets Presented in Consolidated Balance Sheet | 2,372 | [1] |  |
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received | (375) | [1],[2] |  |
Net Amount | 1,997 | [1] |  |
TBAs |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Assets | 1,496 | [1] | 1,138 | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet | 1,496 | [1] | 1,138 | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | (1,484) | [1],[2] | (656) | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received |  |  | (482) | [1],[2]
Net Amount | 12 | [1] |  |
Gross Amounts of Recognized Liabilities | (3,298) | [1] | (661) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (3,298) | [1] | (661) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,484 | [1],[2] | 656 | [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 1,267 | [1],[2] | 5 | [1],[2]
Net Amount | (547) | [1] |  | [1]
Futures |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities | (411) | [1] | (528) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (411) | [1] | (528) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged | 411 | [1],[2] | 528 | [1],[2]
Net Amount |  |  |  | [1]
Loan warehouse debt |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities | (1,241,074) | [1] | (184,789) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (1,241,074) | [1] | (184,789) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 1,241,074 | [1],[2] | 184,789 | [1],[2]
Net Amount |  |  |  | [1]
Security repurchase agreements |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities | (646,614) | [1] | (677,974) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  | [1] |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet | (646,614) | [1] | (677,974) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments | 646,614 | [1],[2] | 677,974 | [1],[2]
Net Amount |  |  |  | [1]
Commercial borrowings |  |  |  |
Offsetting Asset and Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities |  |  | (49,467) | [1]
Gross Amounts Offset in Consolidated Balance Sheet |  |  |  | [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet |  |  | (49,467) | [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments |  |  | 49,467 | [1],[2]
Net Amount |  |  |  | [1]
[1] | Interest rate agreements, TBAs, and futures are components of derivatives instruments on our consolidated balances sheets. Loan warehouse debt, which is secured by residential and commercial mortgage loans, and security repurchase agreements are components of short-term debt on our consolidated balance sheets.
[2] | Amounts presented in these columns are limited in total to the net amount of assets or liabilities presented in the prior column by instrument. In certain cases, there is excess cash collateral or financial assets we have pledged to a counterparty (which may, in certain circumstances, be a clearinghouse) that exceed the financial liabilities subject to a master netting arrangement or similar agreement. Additionally, in certain cases, counterparties may have pledged excess cash collateral to us that exceeds our corresponding financial assets. In each case, any of these excess amounts are excluded from the table although they are separately reported in our consolidated balance sheets as assets or liabilities, respectively.

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