Supplemental Disclosures of Cash Flow Information - Summary of Supplemental Disclosures of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Jan. 31, 2013 Bank of America Asset Purchase [Member]	Sep. 30, 2013 Bank of America Asset Purchase [Member]	Sep. 30, 2012 Bank of America Asset Purchase [Member]	Sep. 30, 2013 Capitalized Servicing Rights [Member]	Sep. 30, 2013 Capitalized Servicing Rights [Member]	Sep. 30, 2012 Capitalized Servicing Rights [Member]
Schedule Of Supplemental Cash Flow [Line Items]
Servicing rights capitalized upon transfers of loans	$ (80,550)	$ (118,145)		$ 495,700			$ 80,550	$ 118,145
Real estate owned acquired through foreclosure		87,128	50,500
Residential loans originated to finance the sale of real estate owned		48,573	44,190
Payable for acquisition of BOA assets					$ 7,993