Stock-Based Compensation - Summary of Changes in Number of Shares of Restricted Stock and Restricted Stock Units (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Shares
Shares outstanding, beginning of period (in shares) | shares	174
Granted (in shares) | shares	200
Vested (in shares) | shares	(29)
Canceled or forfeited (in shares) | shares	(23)
Shares outstanding, end of period (in shares) | shares	322
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in dollars per share) | $ / shares	$ 265.29
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	272.68
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	267.88
Weighted average grant date fair value, canceled or forfeited (in dollars per share) | $ / shares	288.54
Weighted average grant date fair value, end of period (in dollars per share) | $ / shares	$ 268.02