Stock Based Compensation - Schedule of Stock Options Exercise Price (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Exercise price, options outstanding (in shares)	4,964
Exercise price, options exercisable (in shares)	3,994
$10.00 – $150.74
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 10.00
Exercise price, maximum (in usd per share) | $ / shares	$ 150.74
Exercise price, options outstanding (in shares)	3,541
Exercise price, weighted average remaining vesting life in years	3 days
Exercise price, options exercisable (in shares)	3,488
$151.49 – $165.96
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 151.49
Exercise price, maximum (in usd per share) | $ / shares	$ 165.96
Exercise price, options outstanding (in shares)	242
Exercise price, weighted average remaining vesting life in years	3 months 7 days
Exercise price, options exercisable (in shares)	190
$172.68 – $199.75
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 172.68
Exercise price, maximum (in usd per share) | $ / shares	$ 199.75
Exercise price, options outstanding (in shares)	495
Exercise price, weighted average remaining vesting life in years	1 year 7 months 6 days
Exercise price, options exercisable (in shares)	198
$202.02 – $209.05
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 202.02
Exercise price, maximum (in usd per share) | $ / shares	$ 209.05
Exercise price, options outstanding (in shares)	45
Exercise price, weighted average remaining vesting life in years	1 year 6 months 14 days
Exercise price, options exercisable (in shares)	14
$213.69 – $231.70
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 213.69
Exercise price, maximum (in usd per share) | $ / shares	$ 231.70
Exercise price, options outstanding (in shares)	351
Exercise price, weighted average remaining vesting life in years	2 years 9 months 29 days
Exercise price, options exercisable (in shares)	37
$248.28 – $263.21
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 248.28
Exercise price, maximum (in usd per share) | $ / shares	$ 263.21
Exercise price, options outstanding (in shares)	271
Exercise price, weighted average remaining vesting life in years	2 years 29 days
Exercise price, options exercisable (in shares)	64
$288.37 – $319.55
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 288.37
Exercise price, maximum (in usd per share) | $ / shares	$ 319.55
Exercise price, options outstanding (in shares)	19
Exercise price, weighted average remaining vesting life in years	2 years 7 months 17 days
Exercise price, options exercisable (in shares)	3