Name:	us-gaap_FeesAndCommissionsMortgageBankingAndServicing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7,9)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_GainLossOnSecuritizationOfFinancialAssets
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
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Data Type:	xbrli:stringItemType
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The amount of expense during the period for co-broker fees paid for obtaining loans.

No definition available.

Name:	wd_CoBrokersFees
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Income from contractual loan origination related fees net of co-broker fees.

No definition available.

Name:	wd_ContractualLoanOriginationFeesNet
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Income from the estimated fair value of the expected net future cash flows associated with the servicing of loans.

No definition available.

Name:	wd_FairValueOfExpectedFutureCashFlowsFromServicingRightsRecognizedAtCommitment
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Decrease in gains from mortgage banking gains due to the recognition at commitment of the fair value of expected guaranty obligations.

No definition available.