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NONCONTROLLING INTERESTS - Changes in Ownership of OpCo Units in Nerdy LLC (Details) - 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
Member Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Vesting or exercise of equity awards (in shares)	1,671		1,996		3,328	4,000
Nerdy LLC
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance, common (in shares)	183,751	182,094	175,676	173,672	182,094	173,672	173,672
Ending balance, common (in shares)	185,422	183,751	177,672	175,676	185,422	177,672	182,094	173,672
Nerdy LLC | Nerdy Inc.
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance, common (in shares)	119,356	117,699	109,002	106,416	117,699	106,416	106,416
Conversion of combined interests into Class A Common Stock (in shares)	0		1,295		0	1,926
Ending balance, common (in shares)	121,027	119,356	112,245	109,002	121,027	112,245	117,699	106,416
Ownership percentage, beginning and end of period	65.30%	65.00%	63.20%	62.00%	65.30%	63.20%	64.60%	61.30%
Nerdy LLC | Legacy Nerdy Holders
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance, common (in shares)	64,395	64,395	66,674	67,256	64,395	67,256	67,256
Conversion of combined interests into Class A Common Stock (in shares)	0		(1,295)		0	(1,926)
Ending balance, common (in shares)	64,395	64,395	65,427	66,674	64,395	65,427	64,395	67,256
Ownership percentage, beginning and end of period	34.70%	35.00%	36.80%	38.00%	34.70%	36.80%	35.40%	38.70%
Nerdy Inc. | Member Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Vesting or exercise of equity awards (in shares)	1,671		1,948		3,328	3,903
Legacy Nerdy Holders | Member Units
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Vesting or exercise of equity awards (in shares)	0		48		0	97

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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