Stock-Based Compensation - Summary of Changes in Number of Shares of Restricted Stock and Restricted Stock Units (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Shares
Shares outstanding, beginning of period (in shares) | shares	243,000
Granted (in shares) | shares	71,000
Vested (in shares) | shares	(79,000)
Canceled (in shares) | shares	(4,000)
Shares outstanding, end of period (in shares) | shares	231,000
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in dollars per share) | $ / shares	$ 246.34
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	213.90
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	201.09
Weighted average grant date fair value, canceled (in dollars per share) | $ / shares	251.62
Weighted average grant date fair value, end of period (in dollars per share) | $ / shares	$ 249.52