Residential Loans Held-for-Investment Future Minimum Annual Principal Payments Under Residential Loans, Held for Investments (Detail) (Residential Mortgage, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Within one year	$ 43,190
One to three years	91,573
Three to five years	98,959
Greater than or equal to five years	2,054,192
Total	$ 2,287,914