Stock-Based Compensation - Summary of Unrecognized Compensation Cost and Related Weighted Average Recognition Period Associated with Unvested restricted Stock Awards and Unvested PSU Awards (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized compensation cost	$ 260,538
Weighted average period for recognition (years)	3 years 10 months 24 days
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unrecognized compensation cost	$ 17,683
Weighted average period for recognition (years)	2 years 3 months 18 days