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Stock-Based Compensation - Narrative (Details) - Marketwise, LLC - USD ($) $ / shares in Units, $ 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 47,445	$ 78,627	$ 648,520	$ 99,124	$ 553,600	$ 20,439	$ 28,212
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense					$ 553,600	$ 20,439	$ 28,212
Weighted-average grant date fair value (in dollars per share)			$ 2,195.16	$ 178.69	$ 178.69	$ 186.83

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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