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NONCONTROLLING INTERESTS - Narrative (Details) - Nerdy LLC - shares shares in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Common units	185,422	183,751	177,672	175,676	185,422	177,672	182,094	173,672
Legacy Nerdy Holders
Noncontrolling Interest [Line Items]
Common units	64,395	64,395	65,427	66,674	64,395	65,427	64,395	67,256
Economic interest, LLC ownership percentage	34.70%	35.00%	36.80%	38.00%	34.70%	36.80%	35.40%	38.70%
Legacy Nerdy Holders | Class B common stock
Noncontrolling Interest [Line Items]
Common units	64,395				64,395		64,395
Nerdy Inc.
Noncontrolling Interest [Line Items]
Common units	121,027	119,356	112,245	109,002	121,027	112,245	117,699	106,416
Economic interest, LLC ownership percentage	65.30%	65.00%	63.20%	62.00%	65.30%	63.20%	64.60%	61.30%

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

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