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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 |

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