Servicing of Residential Loans - Summary of Activity in Servicing Rights Carried at Fair Value (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Servicing Asset At Amortized Value Additional Disclosures [Abstract]
Fair value of servicing rights	$ 1,496,073us-gaap_ServicingAssetAtFairValueAmount	$ 1,513,830us-gaap_ServicingAssetAtFairValueAmount	$ 1,131,124us-gaap_ServicingAssetAtFairValueAmount	$ 888,210us-gaap_ServicingAssetAtFairValueAmount	$ 766,943us-gaap_ServicingAssetAtFairValueAmount	$ 0us-gaap_ServicingAssetAtFairValueAmount

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

Name:	us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant