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Common Units (Details)
 12 Months Ended
Dec. 31, 2020
shares
Dec. 31, 2018
Dec. 31, 2021
shares
Jun. 30, 2021
shares
Marketwise, LLC        
Class of Stock [Line Items]        
Common stock split ratio   1,000    
Related party, minimum ownership percentage 50.00%      
Purchase price multiplier, preceding period 3 years      
Common Class A        
Class of Stock [Line Items]        
Common stock, authorized (in shares) 200,000,000     200,000,000
Common Class A | Marketwise, LLC        
Class of Stock [Line Items]        
Common stock, authorized (in shares)     10,000,000  
Redeemable common units, percent 20.00%      
Common Class B        
Class of Stock [Line Items]        
Common stock, authorized (in shares) 20,000,000     20,000,000
Common Class B | Marketwise, LLC        
Class of Stock [Line Items]        
Common stock, authorized (in shares)     10,000,000  
Repurchase period, common units 25 months