Stockholders' Equity - Narrative (Detail) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2022 USD ($) alternative	Sep. 30, 2022 USD ($) agreement $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) agreement $ / shares shares	Sep. 30, 2021 USD ($) shares
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, approved (in shares) | shares				856,959
Weighted-average grant date fair value (in dollars per share) | $ / shares				$ 661.64
Requisite service period (in years)				3 years 6 months 7 days
2020 ATM Program and Equity Forward Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, equity offering agreement, authorized	$ 1,500.0
Number of settlement alternatives | alternative	3
Equity Forward Amendment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of forward sale agreements | agreement		5		5
Issuance of common stock, shares sold | shares				579,873
Issuance of common stock, weighted average price (in dollars per share) | $ / shares		$ 678.72		$ 678.72
Gross proceeds from sale of stock				$ 393.6
2020 ATM Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, equity offering agreement, available for sale		$ 200.0		$ 200.0
Issuance of common stock in offering (in shares) | shares		580,833		580,833	137,604
Gross proceeds from sale of stock		$ 403.6	$ 99.6	$ 403.6	$ 99.6