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Stock-Based Compensation - Stock Options Outstanding Roll Forward (Detail) - Equity Option [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2018	1,790
Granted	146	321	389
Exercised	(406)
Canceled	(75)
Outstanding at December 31, 2019	1,455	1,790
Weighted-average exercise price of options outstanding at beginning of period	$ 142.47
Weighted-average exercise price of options granted	230.37	$ 196.78	$ 170.24
Weighted-average exercise price of options exercised	113.06
Weighted average exercise price of options canceled	159.67
Weighted-average exercise price of options outstanding at end of period	158.61	142.47
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price of options outstanding at beginning of period	38.09
Weighted-average exercise price of options granted	183.41
Weighted-average exercise price of options exercised	38.09
Weighted average exercise price of options canceled	113.36
Weighted-average exercise price of options outstanding at end of period	61.63	38.09
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price of options outstanding at beginning of period	208.47
Weighted-average exercise price of options granted	238.52
Weighted-average exercise price of options exercised	208.47
Weighted average exercise price of options canceled	238.52
Weighted-average exercise price of options outstanding at end of period	$ 238.52	$ 208.47

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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-SubTopic 10
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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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