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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
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