MEMBERS' EQUITY OF NERDY LLC - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
anniversary
shares
Dec. 31, 2020
USD ($)
shares
Sep. 20, 2021
shares
Dec. 31, 2019
shares
Nerdy LLC        
Class of Stock [Line Items]        
Common unit, authorized (in units)   54,761    
Common unit, issued (in units)   54,761    
Common units, outstanding (in units)   54,761 157,846,000  
Class B Redeemable Preferred Units        
Class of Stock [Line Items]        
Redeemable Preferred Units, authorized (in units)   25,920,000    
Redeemable Preferred Units, issued (in units)   25,920,000    
Redeemable Preferred Units, outstanding (in units) 0 25,920,000   25,920,000
Redemption rate   0.33    
Redemption period 60 days      
Redemption, number of anniversaries | anniversary 2      
Class B Redeemable Preferred Units | Nerdy LLC        
Class of Stock [Line Items]        
Redeemable Preferred Units, authorized (in units)   25,920,000    
Redeemable Preferred Units, issued (in units)   25,920,000    
Redeemable Preferred Units, outstanding (in units)   25,920,000    
Accretion recognized | $   $ 150,146    
Class C Redeemable Preferred Units        
Class of Stock [Line Items]        
Redeemable Preferred Units, authorized (in units)   11,895,000    
Redeemable Preferred Units, issued (in units)   11,895,000    
Redeemable Preferred Units, outstanding (in units) 0 11,895,000   11,895,000
Redemption rate   0.33    
Redemption period 60 days      
Redemption, number of anniversaries | anniversary 2      
Class C Redeemable Preferred Units | Nerdy LLC        
Class of Stock [Line Items]        
Redeemable Preferred Units, authorized (in units)   11,895,000    
Redeemable Preferred Units, issued (in units)   11,895,000    
Redeemable Preferred Units, outstanding (in units)   11,895,000    
Accretion recognized | $   $ 69,111    
Class A Preferred Units        
Class of Stock [Line Items]        
Preferred unit, authorized (in units)   5,060,000    
Preferred units, issued (in units)   5,060,000    
Preferred units, outstanding (in units)   5,060,000    
Right to receive, rate   3    
Class A Preferred Units | Nerdy LLC        
Class of Stock [Line Items]        
Preferred unit, authorized (in units)   5,060,000    
Preferred units, issued (in units)   5,060,000    
Preferred units, outstanding (in units)   5,060,000    
Cumulative dividends | $   $ 1,909    
Class A-1 Preferred Units        
Class of Stock [Line Items]        
Preferred unit, authorized (in units)   5,007,000    
Preferred units, issued (in units)   5,007,000    
Preferred units, outstanding (in units)   5,007,000    
Class A-1 Preferred Units | Nerdy LLC        
Class of Stock [Line Items]        
Preferred unit, authorized (in units)   5,007,000    
Preferred units, issued (in units)   5,007,000    
Preferred units, outstanding (in units)   5,007,000    
Cumulative dividends | $   $ 1,715