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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Marketwise, LLC      
Liabilities:      
Derivative liabilities, current $ 662,000 $ 0  
Derivative liabilities, noncurrent   4,343,000 $ 1,274,000
Recurring | Marketwise, LLC      
Assets:      
Total assets 101,503,000 25,016,000 133,631,000
Liabilities:      
Derivative liabilities, current 662,000    
Total liabilities 1,238,265,000 597,578,000 119,307,000
Recurring | Phantom Interests in Net Income | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 1,955,000 4,343,000 1,274,000
Recurring | Class B Units | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 1,235,648,000 593,235,000 118,033,000
Recurring | Money market funds | Marketwise, LLC      
Assets:      
Money market funds 101,503,000 25,016,000 133,631,000
Level 1 | Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account 414,268,577 414,209,593  
Total fair value 448,009,577 449,595,643  
Level 1 | Recurring | Marketwise, LLC      
Assets:      
Total assets 101,503,000 25,016,000 133,631,000
Liabilities:      
Derivative liabilities, current 0    
Total liabilities 0 0 0
Level 1 | Recurring | Phantom Interests in Net Income | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 0 0 0
Level 1 | Recurring | Class B Units | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 0 0 0
Level 1 | Recurring | Money market funds | Marketwise, LLC      
Assets:      
Money market funds 101,503,000 25,016,000 133,631,000
Level 1 | Recurring | Public Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Liability 33,741,000 35,386,050  
Level 1 | Recurring | Private Placement Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account 0 0  
Level 2 | Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account 0 0  
Total fair value 0 0  
Level 2 | Recurring | Marketwise, LLC      
Assets:      
Total assets 0 0 0
Liabilities:      
Derivative liabilities, current 0    
Total liabilities 0 0 0
Level 2 | Recurring | Phantom Interests in Net Income | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 0 0 0
Level 2 | Recurring | Class B Units | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 0 0 0
Level 2 | Recurring | Money market funds | Marketwise, LLC      
Assets:      
Money market funds 0 0 0
Level 2 | Recurring | Public Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Liability 0 0  
Level 2 | Recurring | Private Placement Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account 0 0  
Level 3 | Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account 0 0  
Total fair value 16,756,400 18,415,060  
Level 3 | Recurring | Marketwise, LLC      
Assets:      
Total assets 0 0 0
Liabilities:      
Derivative liabilities, current 662,000    
Total liabilities 1,238,265,000 597,578,000 119,307,000
Level 3 | Recurring | Phantom Interests in Net Income | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 1,955,000 4,343,000 1,274,000
Level 3 | Recurring | Class B Units | Marketwise, LLC      
Liabilities:      
Derivative liabilities, noncurrent 1,235,648,000 593,235,000 118,033,000
Level 3 | Recurring | Money market funds | Marketwise, LLC      
Assets:      
Money market funds 0 0 $ 0
Level 3 | Recurring | Public Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Liability 0 0  
Level 3 | Recurring | Private Placement Warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Trust Account $ 16,756,400 $ 18,415,060