SHHL Redeemable Preferred Shares and SHHL Redeemable C Ordinary Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Jul. 19, 2021	Mar. 31, 2021
Redeemable Class C Common Stock [Member]
Redeemable Preferred Shares [Line Items]
Temporary equity shares issued		21,187,494
Temporary equity stock issued during the period shares		4,751,497
Gross proceeds from redeemable common stock		$ 47
Senior Convertible Preference Shares [Member]
Redeemable Preferred Shares [Line Items]
Temporary equity shares issued		12,970,766
Temporary equity liquidation preference		$ 175
Temporary equity liquidation preference per share		$ 13.49
Proceeds from issuance of redeemable preferred stock		$ 162
Payments of stock issuance costs		$ 13
Convertible preferred stock, shares issued upon conversion	15,526,619
Non cash preferred stock dividend rate		8.00%
Common Class B [Member]
Redeemable Preferred Shares [Line Items]
Temporary equity shares converted into permanent equity	10,871,215
Class A Common Stock [Member]
Redeemable Preferred Shares [Line Items]
Temporary equity shares converted into permanent equity	6,592,023