Loss Per Share - Summary of computation of basic and diluted loss (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (46,222)	$ (176,843)	$ (1,815)	$ (1,125)	$ (223,065)	$ (2,941)
Denominator:
Weighted average Class A and Class B Common shares outstanding- Basic and Diluted	295,275,773		105,433,103		287,589,053	105,430,073
Net loss per share attributable to Class A and Class B Common shareholders- Basic and Diluted	$ (0.16)		$ (0.02)		$ (0.78)	$ (0.03)
Class A Common Stock
Denominator:
Weighted Average Number of Shares Outstanding, Basic	162,921,645		241,166		155,234,925	238,136
Class B Common Stock
Denominator:
Weighted Average Number of Shares Outstanding, Basic	132,354,128		105,191,937		132,354,128	105,191,937