Summary of Stock Option Activity (Detail) - Stock Option Awards $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Options outstanding, shares
Beginning Balance | shares	1,634
Granted | shares	0
Exercised | shares	(3)
Forfeited/Expired | shares	(30)
Ending Balance | shares	1,601
Exercisable as of March 31, 2020 | shares	925
Expected to vest as of March 31, 2020 | shares	676
Total | shares	1,601
Weighted Average Exercise Price Per Share
Beginning Balance | $ / shares	$ 141.60
Granted | $ / shares	0
Exercised | $ / shares	130.85
Forfeited/Expired | $ / shares	152.22
Ending Balance | $ / shares	141.41
Exercisable as of March 31, 2020 | $ / shares	137.95
Expected to vest as of March 31, 2020 | $ / shares	146.13
Total | $ / shares	$ 141.41
Aggregate Intrinsic Value
Exercised | $	$ 53
Exercisable as of March 31, 2020 | $	0
Expected to vest as of March 31, 2020 | $	0
Total | $	$ 0
Weighted Average Remaining Contractual Term (Years)
Exercisable as of March 31, 2020	4 years 10 months 24 days
Expected to vest as of March 31, 2020	9 years
Total	6 years 8 months 12 days