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Schedule of Information about All Outstanding Options (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number, Options Outstanding	9,674,791	9,639,949	8,770,133	8,400,183
Weighted average exercise price, Options Outstanding	$ 115.39	$ 112.40	$ 99.06	$ 80.50
Aggregate intrinsic value, Options Outstanding	$ 43,806,400
Weighted average remaining contractual life, Options Outstanding	2 years 7 months 6 days
Number, Options Exercisable	3,724,179
Weighted Average Exercise Price, Options Exercisable	$ 106.77
Aggregate intrinsic value, Options Exercisable	$ 43,594,160
Weighted average remaining contractual life, Options Exercisable	1 year 4 months 24 days

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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