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Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Contract
Dec. 31, 2013
Contract
Short-term Debt [Line Items]    
Number of Facilities 15 13
Outstanding $ 1,718,430 $ 862,763
Residential Loans
    
Short-term Debt [Line Items]    
Number of Facilities 5 5
Outstanding 852,267 184,789
Limit 1,400,000 1,400,000
Residential Loans | Minimum
    
Short-term Debt [Line Items]    
Maturity 2014-07 2014-01
Residential Loans | Maximum
    
Short-term Debt [Line Items]    
Maturity 2015-04 2014-12
Commercial Loans
    
Short-term Debt [Line Items]    
Number of Facilities 1 1
Outstanding 12,413  
Limit 100,000 100,000
Maturity 2015-04 2014-04
Real Estate Securities
    
Short-term Debt [Line Items]    
Number of Facilities 9 7
Outstanding $ 853,750 $ 677,974
Real Estate Securities | Minimum
    
Short-term Debt [Line Items]    
Maturity 2014-07 2014-01
Real Estate Securities | Maximum
    
Short-term Debt [Line Items]    
Maturity 2014-09 2014-02