SERVICING (Details) (USD $) In Billions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
SERVICING
Unpaid principal balance	$ 36.8	$ 16.9

Amount of unpaid principal balance of loans in the entity's service portfolio.

No definition available.

Name:	wd_ServicingPortfolioLoansUnpaidPrincipalBalance
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant