Stock Based Compensation - Schedule of Stock Options Exercise Price (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Class of Stock [Line Items]
Exercise price, options outstanding (in shares)	6,263
Exercise price, options exercisable (in shares)	5,137
$10.00 – $114.90
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 10.00
Exercise price, maximum (in usd per share) | $ / shares	$ 114.90
Exercise price, options outstanding (in shares)	2,242
Exercise price, weighted average remaining vesting life in years	0 days
Exercise price, options exercisable (in shares)	2,242
121.76 – 150.74
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 121.76
Exercise price, maximum (in usd per share) | $ / shares	$ 150.74
Exercise price, options outstanding (in shares)	2,834
Exercise price, weighted average remaining vesting life in years	6 days
Exercise price, options exercisable (in shares)	2,516
151.16 – 165.96
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 151.16
Exercise price, maximum (in usd per share) | $ / shares	$ 165.96
Exercise price, options outstanding (in shares)	352
Exercise price, weighted average remaining vesting life in years	18 days
Exercise price, options exercisable (in shares)	227
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)	342
Exercise price, weighted average remaining vesting life in years	1 year 3 months 14 days
Exercise price, options exercisable (in shares)	124
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)	69
Exercise price, weighted average remaining vesting life in years	2 years 3 months 10 days
Exercise price, options exercisable (in shares)	7
216.18 – 231.70
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 216.18
Exercise price, maximum (in usd per share) | $ / shares	$ 231.70
Exercise price, options outstanding (in shares)	144
Exercise price, weighted average remaining vesting life in years	2 years 9 months 25 days
Exercise price, options exercisable (in shares)	21
252.50 – 288.37
Class of Stock [Line Items]
Exercise price, minimum (in usd per share) | $ / shares	$ 252.50
Exercise price, maximum (in usd per share) | $ / shares	$ 288.37
Exercise price, options outstanding (in shares)	280
Exercise price, weighted average remaining vesting life in years	2 years 10 months 17 days
Exercise price, options exercisable (in shares)	0