Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum committed borrowing capacity under a credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	wd_LineOfCreditFacilityCommittedBorrowingCapacity
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum uncommitted borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	wd_LineOfCreditFacilityUncommittedBorrowingCapacity
Namespace Prefix:	wd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

WAREHOUSE NOTES PAYABLE AND NOTES PAYABLE - Summary Information (Detail) - USD ($) $ in Thousands	1 Months Ended			6 Months Ended
	Jun. 30, 2023	May 31, 2023	Apr. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Warehouse notes payable
Outstanding Balance	$ 1,342,187			$ 1,342,187	$ 537,531
Loans Held for Sale \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	1,825,000			1,825,000
Uncommitted Amount	3,540,000			3,540,000
Total Facility Capacity	5,365,000			5,365,000
Outstanding Balance	1,288,789			1,288,789
National Banks \| Loans Held for Sale \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	1,825,000			1,825,000
Uncommitted Amount	2,040,000			2,040,000
Total Facility Capacity	3,865,000			3,865,000
Outstanding Balance	1,056,469			1,056,469
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #1 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	325,000			325,000
Uncommitted Amount	250,000			250,000
Total Facility Capacity	575,000			575,000
Outstanding Balance	68,449			$ 68,449
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #1 \| Agency Warehouse Facility \| SOFR
Warehouse notes payable
Percentage added to reference rate				1.30%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #2 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	700,000			$ 700,000
Uncommitted Amount	300,000			300,000
Total Facility Capacity	1,000,000			1,000,000
Outstanding Balance	441,608			$ 441,608
Maturity date			Apr. 12, 2024
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #2 \| Agency Warehouse Facility \| SOFR
Warehouse notes payable
Percentage added to reference rate				1.30%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #3 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	600,000			$ 600,000
Uncommitted Amount	265,000			265,000
Total Facility Capacity	865,000			865,000
Outstanding Balance	363,355			$ 363,355
Maturity date		May 15, 2024
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #3 \| Agency Warehouse Facility \| SOFR
Warehouse notes payable
Percentage added to reference rate				1.35%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #4 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	200,000			$ 200,000
Uncommitted Amount	225,000			225,000
Total Facility Capacity	425,000			425,000
Outstanding Balance	$ 118,998			$ 118,998
Maturity date	Jun. 22, 2024
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #4 \| Agency Warehouse Facility \| SOFR
Warehouse notes payable
Percentage added to reference rate		1.30%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #4 \| Agency Warehouse Facility \| SOFR \| Minimum
Warehouse notes payable
Percentage added to reference rate	1.30%			1.30%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #4 \| Agency Warehouse Facility \| SOFR \| Maximum
Warehouse notes payable
Percentage added to reference rate	1.35%			1.35%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #5 \| Agency Warehouse Facility
Warehouse notes payable
Uncommitted Amount	$ 1,000,000			$ 1,000,000
Total Facility Capacity	1,000,000			1,000,000
Outstanding Balance	64,059			$ 64,059
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #5 \| Agency Warehouse Facility \| SOFR
Warehouse notes payable
Percentage added to reference rate				1.45%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility
Warehouse notes payable
Total Facility Capacity	454,800			$ 454,800
Outstanding Balance	53,800			$ 53,800
National Banks \| Loans Held for Investment \| Interim Warehouse Facility \| SOFR \| Minimum
Warehouse notes payable
Percentage added to reference rate				1.35%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility \| SOFR \| Maximum
Warehouse notes payable
Percentage added to reference rate				3.25%
Fannie Mae \| Loans Held for Sale \| Fannie Mae Repurchase Agreement, Uncommitted Line and Open Maturity \| Agency Warehouse Facility
Warehouse notes payable
Uncommitted Amount	1,500,000			$ 1,500,000
Total Facility Capacity	1,500,000			1,500,000
Outstanding Balance	$ 232,320			$ 232,320