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Offsetting of Financial Assets, Liabilities, and Collateral (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets $ 5,807 [1] $ 7,704 [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 5,807 [1] 7,704 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (3,071) [1],[2] (6,058) [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received   (482) [1],[2]
Net Amount 2,736 [1] 1,164 [1]
Gross Amounts of Recognized Liabilities (1,810,017) [1] (930,018) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (1,810,017) [1] (930,018) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,774,417 [1],[2] 918,288 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 34,305 [1],[2] 11,730 [1],[2]
Net Amount (1,295) [1]  
Interest Rate Swaps
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 1,925 [1] 6,566 [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 1,925 [1] 6,566 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (572) [1],[2] (5,402) [1],[2]
Net Amount 1,353 [1] 1,164 [1]
Gross Amounts of Recognized Liabilities (32,637) [1] (16,599) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (32,637) [1] (16,599) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 572 [1],[2] 5,402 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 32,065 [1],[2] 11,197 [1],[2]
Credit Default Swap
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 588 [1]  
Gross Amounts Offset in Consolidated Balance Sheet    [1]  
Net Amounts of Assets Presented in Consolidated Balance Sheet 588 [1]  
Net Amount 588 [1]  
TBAs
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 3,294 [1] 1,138 [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 3,294 [1] 1,138 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (2,499) [1],[2] (656) [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received   (482) [1],[2]
Net Amount 795 [1]  
Gross Amounts of Recognized Liabilities (5,540) [1] (661) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (5,540) [1] (661) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 2,499 [1],[2] 656 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 1,746 [1],[2] 5 [1],[2]
Net Amount (1,295) [1]  
Futures
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Gross Amounts of Recognized Liabilities (494) [1] (528) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (494) [1] (528) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 494 [1],[2] 528 [1],[2]
Loan warehouse debt
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (864,680) [1] (184,789) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (864,680) [1] (184,789) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 864,680 [1],[2] 184,789 [1],[2]
Security repurchase agreements
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (853,750) [1] (677,974) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (853,750) [1] (677,974) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 853,750 [1],[2] 677,974 [1],[2]
Commercial borrowings
    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (52,916) [1] (49,467) [1]
Gross Amounts Offset in Consolidated Balance Sheet    [1]    [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (52,916) [1] (49,467) [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments $ 52,916 [1],[2] $ 49,467 [1],[2]
[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. Commercial borrowings are a component of long-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.