Details of Retention and Purchase of MSRs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Mortgage Servicing Rights [Line Items]
MSR Value			$ 11,976	$ 28,614
Mortgage Servicing Rights
Mortgage Servicing Rights [Line Items]
MSR Value	11,807	16,148	14,666	28,614
Associated Principal	1,196,493		1,469,773
Mortgage Servicing Rights \| Jumbo MSR Additions
Mortgage Servicing Rights [Line Items]
MSR Value	2,186		2,674
Associated Principal	257,201		315,994
Mortgage Servicing Rights \| Jumbo MSR Additions \| Securitization
Mortgage Servicing Rights [Line Items]
MSR Value	2,186		2,186
Associated Principal	257,201		257,201
Mortgage Servicing Rights \| Jumbo MSR Additions \| Loan Sales
Mortgage Servicing Rights [Line Items]
MSR Value			488
Associated Principal			58,793
Mortgage Servicing Rights \| Conforming MSR Additions
Mortgage Servicing Rights [Line Items]
MSR Value	9,621		11,992
Associated Principal	939,292		1,153,779
Mortgage Servicing Rights \| Conforming MSR Additions \| Loan Sales
Mortgage Servicing Rights [Line Items]
MSR Value	7,495		9,302
Associated Principal	725,339		880,437
Mortgage Servicing Rights \| Conforming MSR Additions \| From purchases
Mortgage Servicing Rights [Line Items]
MSR Value	2,126		2,690
Associated Principal	$ 213,953		$ 273,342