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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

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