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Stock-Based Compensation - Stock-Based Compensation Expense Recognized in Company's Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	May 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			$ 311,020	$ 236,539	$ 180,716
Issuance of common stock (in shares)	2,587,500	2,985,575
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			289,426	217,541	165,141
RSAs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			$ 8,289	0	0
Issuance of common stock (in shares)			48,799
Employee stock purchase plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			$ 13,305	18,998	15,575
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			32,893	25,355	18,247
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			72,895	56,719	53,448
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense			$ 205,232	$ 154,465	$ 109,021