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

No definition available.

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

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ 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

+ 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

No definition available.

+ 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

The interest rate percentage floor when determining variable rate options under the terms of a debt agreement.

+ References

No definition available.

+ Details

Name:	wd_DebtInstrumentInterestRateFloor
Namespace Prefix:	wd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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 - Summary Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Warehouse notes payable
Committed Amount	$ 2,559,810		$ 2,559,810
Uncommitted Amount	3,340,000		3,340,000
Total Facility Capacity	5,899,810		5,899,810
Outstanding Balance	1,125,677		1,125,677	$ 1,941,572
Debt issuance costs	(482)		(482)
Loans Held for Sale \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	2,075,000		2,075,000
Uncommitted Amount	3,340,000		3,340,000
Total Facility Capacity	5,415,000		5,415,000
Outstanding Balance	933,104		933,104
National Banks \| Agency Warehouse Facility
Warehouse notes payable
Total Facility Capacity	3,900,000		3,900,000
National Banks \| Interim Warehouse Facility
Warehouse notes payable
Total Facility Capacity	500,000		500,000
National Banks \| Tax Credit Equity Warehouse Facility
Warehouse notes payable
Committed Amount	30,000		30,000
Total Facility Capacity	30,000		30,000
Outstanding Balance	9,777		$ 9,777
Maturity date			Aug. 30, 2022
National Banks \| Tax Credit Equity Warehouse Facility \| 30-day LIBOR
Warehouse notes payable
Percentage added to reference rate		3.00%
National Banks \| Tax Credit Equity Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate			3.00%
National Banks \| Tax Credit Equity Warehouse Facility \| Adjusted Term SOFR \| Minimum
Warehouse notes payable
Interest rate floor			1.50%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	2,075,000		$ 2,075,000
Uncommitted Amount	1,840,000		1,840,000
Total Facility Capacity	3,915,000		3,915,000
Outstanding Balance	861,985		861,985
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #1 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	425,000		425,000
Total Facility Capacity	425,000		425,000
Outstanding Balance	105,286		$ 105,286
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #1 \| Agency Warehouse Facility \| Adjusted Term 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	$ 272,369		$ 272,369
Maturity date	Apr. 13, 2023
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #2 \| Agency Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate	1.30%		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	$ 287,275		$ 287,275
Maturity date	May 15, 2023
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #3 \| Agency Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate	1.35%		1.35%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #3 \| Agency Warehouse Facility \| Adjusted Term SOFR \| Minimum
Warehouse notes payable
Interest rate floor	0.15%
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	$ 350,000	425,000
Outstanding Balance	$ 128,251		$ 128,251
Maturity date	Jun. 22, 2023
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #4 \| Agency Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate	1.30%		1.30%
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	68,804		$ 68,804
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #5 \| Agency Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate			1.45%
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #6 \| Agency Warehouse Facility
Warehouse notes payable
Committed Amount	150,000		$ 150,000
Uncommitted Amount	50,000		50,000
Total Facility Capacity	200,000		$ 200,000
National Banks \| Loans Held for Sale \| Agency Warehouse Facility #6 \| Agency Warehouse Facility \| 30-day LIBOR
Warehouse notes payable
Percentage added to reference rate			1.30%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility
Warehouse notes payable
Committed Amount	454,810		$ 454,810
Total Facility Capacity	454,810		454,810
Outstanding Balance	183,278		183,278
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #1 \| Interim Warehouse Facility
Warehouse notes payable
Committed Amount	135,000		135,000
Total Facility Capacity	$ 135,000		$ 135,000
Maturity date	May 15, 2023
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #1 \| Interim Warehouse Facility \| Adjusted Term SOFR
Warehouse notes payable
Percentage added to reference rate	1.80%		1.80%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #2 \| Interim Warehouse Facility
Warehouse notes payable
Committed Amount	$ 100,000		$ 100,000
Total Facility Capacity	100,000		$ 100,000
Maturity date		Dec. 13, 2023
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #2 \| Interim Warehouse Facility \| Adjusted Term SOFR \| Minimum
Warehouse notes payable
Percentage added to reference rate			1.35%	1.35%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #2 \| Interim Warehouse Facility \| Adjusted Term SOFR \| Maximum
Warehouse notes payable
Percentage added to reference rate		1.85%	1.85%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #3 \| Interim Warehouse Facility
Warehouse notes payable
Committed Amount	200,000		$ 200,000
Total Facility Capacity	200,000		200,000
Outstanding Balance	163,468		$ 163,468
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #3 \| Interim Warehouse Facility \| 30-day LIBOR \| Minimum
Warehouse notes payable
Percentage added to reference rate			1.75%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #3 \| Interim Warehouse Facility \| 30-day LIBOR \| Maximum
Warehouse notes payable
Percentage added to reference rate			3.25%
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #4 \| Interim Warehouse Facility
Warehouse notes payable
Committed Amount	19,810		$ 19,810
Total Facility Capacity	19,810		19,810
Outstanding Balance	19,810		$ 19,810
National Banks \| Loans Held for Investment \| Interim Warehouse Facility #4 \| Interim Warehouse Facility \| 30-day LIBOR
Warehouse notes payable
Percentage added to reference rate			3.00%
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	$ 71,119		$ 71,119