SEGMENTS (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024 USD ($) segment	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($) segment	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($) segment	Dec. 31, 2023 USD ($)
Segments
Number of reportable segments | segment	3			3			3	3
Revenues
Total revenues	$ 292,304			$ 268,743			$ 791,039	$ 780,104
Expenses
Personnel	145,538			136,507			390,068	388,425
Amortization and depreciation	57,561			57,479			169,495	170,737
Provision (benefit) for credit losses	2,850			421			6,310	(11,088)
Interest expense on corporate debt	18,232			17,594			53,765	49,878
Goodwill impairment				14,000			0	14,000
Fair value adjustments to contingent consideration liabilities	(1,366)			(14,000)			(1,366)	(14,000)
Other operating expenses	31,984			28,529			93,386	83,322
Total expenses	254,799			240,530			711,658	681,274
Income (loss) from operations	37,505			28,213			79,381	98,830
Income tax expense (benefit)	8,822			7,069			19,588	24,695
Net income (loss) before noncontrolling interests	28,683			21,144			59,793	74,135
Net income (loss) from noncontrolling interests	(119)	$ (2,368)	$ (1,051)	(314)	$ (2,114)	$ 805	(3,538)	(1,623)
Walker & Dunlop net income (loss)	28,802	$ 22,663	$ 11,866	21,458	$ 27,635	$ 26,665	63,331	75,758
Total assets	4,579,231			4,277,851			4,579,231	4,277,851	$ 4,052,347
Loan origination and debt brokerage fees, net
Revenues
Total revenues	73,546			56,149			182,620	168,201
Fair value of expected net cash flows from servicing, net
Revenues
Total revenues	43,426			35,375			97,673	107,446
Servicing fees
Revenues
Total revenues	82,222			79,200			242,683	232,027
Property sales broker fees
Revenues
Total revenues	19,322			16,862			39,408	38,831
Investment management fees
Revenues
Total revenues	11,744			13,362			40,086	44,844
Net warehouse interest income (expense)
Revenues
Total revenues	(2,147)			(2,031)			(4,847)	(3,556)
Placement fees and other interest income
Revenues
Total revenues	43,557			43,000			123,999	109,310
Other revenue
Revenues
Total revenues	20,634			26,826			69,417	83,001
Capital Markets
Expenses
Goodwill impairment							0	14,000
Servicing and Asset Management
Expenses
Goodwill impairment							0	0
Operating Segments | Capital Markets
Revenues
Total revenues	143,712			117,696			343,779	347,685
Expenses
Personnel	104,987			97,973			276,655	281,502
Amortization and depreciation	1,137			1,137			3,412	3,412
Interest expense on corporate debt	4,888			4,874			15,038	13,870
Goodwill impairment				14,000				14,000
Fair value adjustments to contingent consideration liabilities	(1,366)			(14,000)			(1,366)	(14,000)
Other operating expenses	5,137			4,193			14,831	15,037
Total expenses	114,783			108,177			308,570	313,821
Income (loss) from operations	28,929			9,519			35,209	33,864
Income tax expense (benefit)	7,073			2,386			8,689	8,462
Net income (loss) before noncontrolling interests	21,856			7,133			26,520	25,402
Net income (loss) from noncontrolling interests	26			83			353	1,741
Walker & Dunlop net income (loss)	21,830			7,050			26,167	23,661
Total assets	1,711,722			1,424,270			1,711,722	1,424,270
Operating Segments | Capital Markets | Loan origination and debt brokerage fees, net
Revenues
Total revenues	72,723			56,149			180,264	167,679
Operating Segments | Capital Markets | Fair value of expected net cash flows from servicing, net
Revenues
Total revenues	43,426			35,375			97,673	107,446
Operating Segments | Capital Markets | Property sales broker fees
Revenues
Total revenues	19,322			16,862			39,408	38,831
Operating Segments | Capital Markets | Net warehouse interest income (expense)
Revenues
Total revenues	(2,798)			(2,565)			(6,322)	(7,006)
Operating Segments | Capital Markets | Other revenue
Revenues
Total revenues	11,039			11,875			32,756	40,735
Operating Segments | Servicing and Asset Management
Revenues
Total revenues	144,884			148,140			434,351	424,176
Expenses
Personnel	20,951			17,139			59,083	53,669
Amortization and depreciation	54,668			54,375			160,912	161,935
Provision (benefit) for credit losses	2,850			421			6,310	(11,088)
Interest expense on corporate debt	11,711			11,096			33,848	31,385
Other operating expenses	6,611			5,039			18,462	16,465
Total expenses	96,791			88,070			278,615	252,366
Income (loss) from operations	48,093			60,070			155,736	171,810
Income tax expense (benefit)	10,756			15,040			38,430	42,931
Net income (loss) before noncontrolling interests	37,337			45,030			117,306	128,879
Net income (loss) from noncontrolling interests	(145)			(397)			(3,891)	(3,364)
Walker & Dunlop net income (loss)	37,482			45,427			121,197	132,243
Total assets	2,495,600			2,361,245			2,495,600	2,361,245
Operating Segments | Servicing and Asset Management | Loan origination and debt brokerage fees, net
Revenues
Total revenues	823						2,356	522
Operating Segments | Servicing and Asset Management | Servicing fees
Revenues
Total revenues	82,222			79,200			242,683	232,027
Operating Segments | Servicing and Asset Management | Investment management fees
Revenues
Total revenues	11,744			13,362			40,086	44,844
Operating Segments | Servicing and Asset Management | Net warehouse interest income (expense)
Revenues
Total revenues	651			534			1,475	3,450
Operating Segments | Servicing and Asset Management | Placement fees and other interest income
Revenues
Total revenues	40,299			39,475			113,072	100,636
Operating Segments | Servicing and Asset Management | Other revenue
Revenues
Total revenues	9,145			15,569			34,679	42,697
Operating Segments | Corporate
Revenues
Total revenues	3,708			2,907			12,909	8,243
Expenses
Personnel	19,600			21,395			54,330	53,254
Amortization and depreciation	1,756			1,967			5,171	5,390
Interest expense on corporate debt	1,633			1,624			4,879	4,623
Other operating expenses	20,236			19,297			60,093	51,820
Total expenses	43,225			44,283			124,473	115,087
Income (loss) from operations	(39,517)			(41,376)			(111,564)	(106,844)
Income tax expense (benefit)	(9,007)			(10,357)			(27,531)	(26,698)
Net income (loss) before noncontrolling interests	(30,510)			(31,019)			(84,033)	(80,146)
Walker & Dunlop net income (loss)	(30,510)			(31,019)			(84,033)	(80,146)
Total assets	371,909			492,336			371,909	492,336
Operating Segments | Corporate | Placement fees and other interest income
Revenues
Total revenues	3,258			3,525			10,927	8,674
Operating Segments | Corporate | Other revenue
Revenues
Total revenues	$ 450			$ (618)			$ 1,982	$ (431)