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Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Contract
Dec. 31, 2013
Contract
Short-term Debt [Line Items]    
Number of Facilities 17 13
Outstanding $ 1,887,688 $ 862,763
Residential Loans
    
Short-term Debt [Line Items]    
Number of Facilities 5 5
Outstanding 1,188,179 184,789
Limit 1,550,000 1,400,000
Residential Loans | Minimum
    
Short-term Debt [Line Items]    
Maturity 2014-12 2014-01
Residential Loans | Maximum
    
Short-term Debt [Line Items]    
Maturity 2015-08 2014-12
Commercial Loans
    
Short-term Debt [Line Items]    
Number of Facilities 2 1
Outstanding 52,895  
Limit 340,000 100,000
Maturity   2014-04
Commercial Loans | Minimum
    
Short-term Debt [Line Items]    
Maturity 2015-04  
Commercial Loans | Maximum
    
Short-term Debt [Line Items]    
Maturity 2015-09  
Real Estate Securities
    
Short-term Debt [Line Items]    
Number of Facilities 10 7
Outstanding $ 646,614 $ 677,974
Real Estate Securities | Minimum
    
Short-term Debt [Line Items]    
Maturity 2014-10 2014-01
Real Estate Securities | Maximum
    
Short-term Debt [Line Items]    
Maturity 2014-12 2014-02