Capital Stock - Summary of Option Activity under Plans and Related Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options Outstanding, Beginning balance	1,949,089	2,244,363	1,675,506
Number of Stock Options Outstanding, Granted	48,260	696,971	1,256,559
Number of Shares, Options assumed in acquisitions			72,607
Number of Stock Options Outstanding, Exercised or released	(184,737)	(636,424)	(496,297)
Number of Stock Options Outstanding, Cancelled or forfeited	(241,847)	(355,821)	(264,012)
Number of Stock Options Outstanding, Ending balance	1,570,765	1,949,089	2,244,363	1,675,506
Number of Shares, Vested and expected to vest	1,463,772
Number of Shares, Exercisable	967,186
Weighted Average Exercise Price of Stock Options Outstanding	$ 39.64	$ 39.27	$ 33.83	$ 23.78
Weighted Average Exercise Price, Granted	53.59	49.20	41.39
Weighted Average Exercise Price, Options assumed in acquisitions			13.30
Weighted Average Exercise Price, Exercised or released	29.24	29.44	14.85
Weighted Average Exercise Price, Cancelled or forfeited	47.35	$ 42.00	$ 35.85
Weighted-Average Exercise Price, Vested and expected to vest	39.03
Weighted Average Exercise Price, Exercisable	$ 36.66
Weighted-Average Remaining Contractual Term (in years)	6 years 10 months 24 days	8 years 1 month 2 days	8 years 3 months 7 days	8 years 4 days
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest	6 years 9 months 26 days
Weighted Average Remaining Contractual Term (in years), Exercisable	6 years 3 months 22 days
Aggregate Intrinsic Value	$ 9,226	$ 47,480	$ 38,457	$ 40,813
Aggregate Intrinsic Value, Vested and expected to vest	9,061
Aggregate Intrinsic Value, Exercisable	$ 7,339