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Summary of Significant Accounting Policies - Offsetting of Financial Assets, Liabilities, and Collateral (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets $ 28,490 $ 15,257
Gross Amounts Offset in Consolidated Balance Sheet   0
Net Amounts of Assets Presented in Consolidated Balance Sheet 28,490 15,257
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (18,591) (6,975)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received (6,856) (4,735)
Net Amount 3,043 3,547
Gross Amounts of Recognized Liabilities (1,834,701) (1,851,876)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (1,834,701) (1,851,876)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,765,695 1,800,800
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 63,989 50,100
Net Amount (5,017) (976)
Interest rate agreements    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 16,788 7,006
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in Consolidated Balance Sheet 16,788 7,006
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (9,932) (1,160)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received (6,856) (4,360)
Net Amount 0 1,486
Gross Amounts of Recognized Liabilities (72,415) (48,173)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (72,415) (48,173)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 9,932 1,160
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 59,933 47,013
Net Amount (2,550) 0
Credit Default Index Swaps    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 2,792 1,598
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in Consolidated Balance Sheet 2,792 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 0 (375)
Net Amount 2,792 1,223
TBAs    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 8,910 6,653
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Assets Presented in Consolidated Balance Sheet 8,910 6,653
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (8,659) (5,815)
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amount 251 838
Gross Amounts of Recognized Liabilities (14,994) (9,506)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (14,994) (9,506)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 8,659 5,815
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 3,868 2,715
Net Amount (2,467) (976)
Futures    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (188) (372)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (188) (372)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 0 0
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 188 372
Net Amount 0 0
Loan warehouse debt    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (1,271,610) (1,185,316)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (1,271,610) (1,185,316)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,271,610 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 (475,494) (608,509)
Gross Amounts Offset in Consolidated Balance Sheet 0 0
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (475,494) (608,509)
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 475,494 608,509
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 0 0
Net Amount $ 0 $ 0