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Fair Value Measurements - Schedule of Fair Value Changes by Income Statement Location (Details) - Marketwise, LLC - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Total change in fair value of Class B Units     $ (598,533) $ (49,796) $ (456,457) $ 3,003 $ (5,734)
Common Class B              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Total change in fair value of Class B Units $ 46,989 $ 72,486 598,533 49,796      
Cost of revenue | Common Class B              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Total change in fair value of Class B Units 10,446 13,848 112,389 9,885      
Sales and marketing | Common Class B              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Total change in fair value of Class B Units 840 1,022 8,263 1,022      
General and administrative | Common Class B              
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Total change in fair value of Class B Units $ 35,703 $ 57,616 $ 477,881 $ 38,889