Residential Loans, Net - Aging of Past Due Residential Loans Portfolio Accounted for at Amortized Cost (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 1,462,013	$ 1,510,756
Carried at Amortized Cost [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	20,671	23,543
60-89 Days Past Due	9,047	13,215
90 Days or More Past Due	55,598	66,623
Total Past Due	85,316	103,381
Current	1,376,697	1,407,375
Total	1,462,013	1,510,756
Non-Accrual Loans	$ 55,598	$ 66,623