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Intangible Assets - Fair Value of Residential MSRs (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Line Items]    
Annualized constant prepayment rate ("CPR") 23.20% 21.40%
Constant discount rate 10.80% 11.30%
Weighted average life 3 years 2 months 12 days 3 years 4 months 24 days