SEGMENTS (Details) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segments
Number of operating segments | segment							3
Revenues
Total revenues	$ 268,743			$ 315,611			$ 780,104	$ 975,903
Expenses
Personnel	136,507			157,059			388,425	469,608
Amortization and depreciation	57,479			59,846			170,737	177,101
Provision (benefit) for credit losses	421			1,218			(11,088)	(13,120)
Interest expense on corporate debt	17,594			9,306			49,878	22,123
Other operating expenses	28,529			33,991			83,322	102,400
Total expenses	240,530			261,420			681,274	758,112
Income (loss) from operations	28,213			54,191			98,830	217,791
income tax expense (benefit)	7,069			7,532			24,695	46,495
Net income (loss) before noncontrolling interests	21,144			46,659			74,135	171,296
Net income (loss) from noncontrolling interests	(314)	$ (2,114)	$ 805	(174)	$ (179)	$ (679)	(1,623)	(1,032)
Walker & Dunlop net income (loss)	21,458	$ 27,635	$ 26,665	46,833	$ 54,286	$ 71,209	75,758	172,328
Total assets	4,277,851			6,003,013			4,277,851	6,003,013	$ 4,045,359
Loan origination and debt brokerage fees, Net
Revenues
Total revenues	56,149			90,858			168,201	275,773
Fair value of expected net cash flows from servicing, net
Revenues
Total revenues	35,375			55,291			107,446	159,970
Servicing fees
Revenues
Total revenues	79,200			75,975			232,027	222,916
Property sales broker fees
Revenues
Total revenues	16,862			30,308			38,831	100,092
Investment management fees
Revenues
Total revenues	13,362			16,301			44,844	47,345
Net warehouse interest income (expense)
Revenues
Total revenues	(2,031)			3,980			(3,556)	14,021
Placement fees and other interest income
Revenues
Total revenues	43,000			18,129			109,310	26,683
Other revenue
Revenues
Total revenues	26,826			24,769			83,001	129,103
Operating Segments | Capital Markets
Revenues
Total revenues	117,696			188,540			347,685	572,975
Expenses
Personnel	97,973			128,981			281,502	372,656
Amortization and depreciation	1,137			1,052			3,412	2,191
Interest expense on corporate debt	4,874			2,430			13,870	5,488
Other operating expenses	4,193			6,869			15,037	19,943
Total expenses	108,177			139,332			313,821	400,278
Income (loss) from operations	9,519			49,208			33,864	172,697
income tax expense (benefit)	2,386			12,468			8,462	41,878
Net income (loss) before noncontrolling interests	7,133			36,740			25,402	130,819
Net income (loss) from noncontrolling interests	83			277			1,741	995
Walker & Dunlop net income (loss)	7,050			36,463			23,661	129,824
Total assets	1,424,270			3,093,803			1,424,270	3,093,803
Operating Segments | Capital Markets | Loan origination and debt brokerage fees, Net
Revenues
Total revenues	56,149			89,752			167,679	273,660
Operating Segments | Capital Markets | Fair value of expected net cash flows from servicing, net
Revenues
Total revenues	35,375			55,291			107,446	159,970
Operating Segments | Capital Markets | Property sales broker fees
Revenues
Total revenues	16,862			30,308			38,831	100,092
Operating Segments | Capital Markets | Net warehouse interest income (expense)
Revenues
Total revenues	(2,565)			2,178			(7,006)	9,415
Operating Segments | Capital Markets | Other revenue
Revenues
Total revenues	11,875			11,011			40,735	29,838
Operating Segments | Servicing and Asset Management
Revenues
Total revenues	148,140			129,322			424,176	360,770
Expenses
Personnel	17,139			18,728			53,669	53,211
Amortization and depreciation	54,375			57,139			161,935	170,501
Provision (benefit) for credit losses	421			1,218			(11,088)	(13,120)
Interest expense on corporate debt	11,096			6,324			31,385	15,388
Other operating expenses	5,039			5,237			16,465	15,535
Total expenses	88,070			88,646			252,366	241,515
Income (loss) from operations	60,070			40,676			171,810	119,255
income tax expense (benefit)	15,040			10,204			42,931	28,919
Net income (loss) before noncontrolling interests	45,030			30,472			128,879	90,336
Net income (loss) from noncontrolling interests	(397)			(451)			(3,364)	(2,027)
Walker & Dunlop net income (loss)	45,427			30,923			132,243	92,363
Total assets	2,361,245			2,543,730			2,361,245	2,543,730
Operating Segments | Servicing and Asset Management | Loan origination and debt brokerage fees, Net
Revenues
Total revenues				1,106			522	2,113
Operating Segments | Servicing and Asset Management | Servicing fees
Revenues
Total revenues	79,200			75,975			232,027	222,916
Operating Segments | Servicing and Asset Management | Investment management fees
Revenues
Total revenues	13,362			16,301			44,844	47,345
Operating Segments | Servicing and Asset Management | Net warehouse interest income (expense)
Revenues
Total revenues	534			1,802			3,450	4,606
Operating Segments | Servicing and Asset Management | Placement fees and other interest income
Revenues
Total revenues	39,475			17,760			100,636	26,166
Operating Segments | Servicing and Asset Management | Other revenue
Revenues
Total revenues	15,569			16,378			42,697	57,624
Operating Segments | Corporate
Revenues
Total revenues	2,907			(2,251)			8,243	42,158
Expenses
Personnel	21,395			9,350			53,254	43,741
Amortization and depreciation	1,967			1,655			5,390	4,409
Interest expense on corporate debt	1,624			552			4,623	1,247
Other operating expenses	19,297			21,885			51,820	66,922
Total expenses	44,283			33,442			115,087	116,319
Income (loss) from operations	(41,376)			(35,693)			(106,844)	(74,161)
income tax expense (benefit)	(10,357)			(15,140)			(26,698)	(24,302)
Net income (loss) before noncontrolling interests	(31,019)			(20,553)			(80,146)	(49,859)
Walker & Dunlop net income (loss)	(31,019)			(20,553)			(80,146)	(49,859)
Total assets	492,336			365,480			492,336	365,480
Operating Segments | Corporate | Placement fees and other interest income
Revenues
Total revenues	3,525			369			8,674	517
Operating Segments | Corporate | Other revenue
Revenues
Total revenues	$ (618)			$ (2,620)			$ (431)	$ 41,641