Capital Stock - Summary of Option Activity under Plans and Related Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Stock Options Outstanding, Outstanding - Beginning balance	2,244,363	1,675,506	1,989,237
Number of Stock Options Outstanding, Granted	696,971	1,256,559	631,775
Number of Shares, Options assumed in acquisitions		72,607
Number of Stock Options Outstanding, Exercised or released	(636,424)	(496,297)	(687,719)
Number of Stock Options Outstanding, Cancelled or forfeited	(355,821)	(264,012)	(257,787)
Number of Stock Options Outstanding, Outstanding - Ending balance	1,949,089	2,244,363	1,675,506	1,989,237
Number of Shares, Vested and expected to vest	1,700,981
Number of Shares, Exercisable	609,137
Weighted Average Exercise Price of Stock Options Outstanding	$ 39.27	$ 33.83	$ 23.78	$ 14.08
Weighted Average Exercise Price, Granted	49.20	41.39	36.55
Weighted Average Exercise Price, Options assumed in acquisitions		13.30
Weighted Average Exercise Price, Exercised	29.44	14.85	6.94
Weighted Average Exercise Price, Cancelled or forfeited	42.00	$ 35.85	$ 25.11
Weighted-Average Exercise Price, Vested and expected to vest	38.26
Weighted Average Exercise Price, Exercisable	$ 29.57
Weighted Average Remaining Contractual Term (in years)	8 years 1 month 2 days	8 years 3 months 7 days	8 years 4 days	8 years 1 month 2 days
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest	8 years 4 days
Weighted Average Remaining Contractual Term (in years), Exercisable	6 years 10 months 28 days
Aggregate Intrinsic Value	$ 47,480	$ 38,457	$ 40,813	$ 35,513
Aggregate Intrinsic Value, Vested and expected to vest	43,108
Aggregate Intrinsic Value, Exercisable	$ 20,557