Schedule of Weighted Average Remaining Contractual Life for Options Outstanding and Weighted Average Exercise Price Per Share for Exercisable Options (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Shares		8,770,133	8,400,183	7,897,451	7,620,958
Options Outstanding, Weighted Average Exercise Price Per Share		$ 99.06	$ 80.50	$ 57.29	$ 43.63
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		3 years
Number, Options Exercisable		2,074,867
Weighted Average Exercise Price, Options Exercisable		$ 78.58
Expected to Vest Options , Shares	[1]	4,928,383
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 106.71
Range One
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		36.95
Range, High		$ 53.38
Options Outstanding, Shares		1,397,457
Options Outstanding, Weighted Average Exercise Price Per Share		$ 52.82
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		1 year
Number, Options Exercisable		822,455
Weighted Average Exercise Price, Options Exercisable		$ 52.43
Expected to Vest Options , Shares	[1]	569,396
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 53.38
Range Two
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		66.98
Range, High		$ 102.21
Options Outstanding, Shares		1,938,250
Options Outstanding, Weighted Average Exercise Price Per Share		$ 78.64
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		2 years 2 months 12 days
Number, Options Exercisable		704,425
Weighted Average Exercise Price, Options Exercisable		$ 78.60
Expected to Vest Options , Shares	[1]	1,083,541
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 78.63
Range Three
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		107.39
Range, High		$ 117.29
Options Outstanding, Shares		2,543,876
Options Outstanding, Weighted Average Exercise Price Per Share		$ 117.26
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		3 years 2 months 12 days
Number, Options Exercisable		531,987
Weighted Average Exercise Price, Options Exercisable		$ 117.28
Expected to Vest Options , Shares	[1]	1,572,128
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 117.26
Range Four
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range, Low		118.62
Range, High		$ 142.43
Options Outstanding, Shares		2,890,550
Options Outstanding, Weighted Average Exercise Price Per Share		$ 119.09
Options Outstanding, Weighted Average Remaining Contractual Life (in Years)		4 years 2 months 12 days
Number, Options Exercisable		16,000
Weighted Average Exercise Price, Options Exercisable		$ 134.77
Expected to Vest Options , Shares	[1]	1,703,318
Expected to Vest Options, Weighted Average Exercise Price Per Share		$ 119.09

[1] Assumes a weighted average forfeiture rate of 9.75%.