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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at December 31, 2018	1,455
Granted	267	146	321
Exercised	(456)
Canceled	(199)
Outstanding at December 31, 2019	1,067	1,455
Weighted-average exercise price of options outstanding at beginning of period	$ 158.61
Weighted-average exercise price of options granted	215.12	$ 230.37	$ 196.78
Weighted-average exercise price of options exercised	128.43
Weighted average exercise price of options canceled	192.08
Weighted-average exercise price of options outstanding at end of period	179.59	158.61
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price of options outstanding at beginning of period	61.63
Weighted-average exercise price of options granted	188.63
Weighted-average exercise price of options exercised	61.63
Weighted average exercise price of options canceled	128.93
Weighted-average exercise price of options outstanding at end of period	75.94	61.63
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average exercise price of options outstanding at beginning of period	238.52
Weighted-average exercise price of options granted	235.06
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	$ 238.52

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 price at which option holders acquired shares when converting their stock options into shares.

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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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