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Stock-Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Options
Beginning balance (in shares)	588,024
Granted (in shares)	135,006
Exercised (in shares)	(21,662)
Canceled (in shares)	(82,230)
Ending balance (in shares)	619,138	588,024
Exercisable at period end (in shares)	392,928
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 63.36
Granted (in dollars per share)	77.91
Exercised (in dollars per share)	38.97
Canceled (in dollars per share)	73.41
Ending balance (in dollars per share)	66.35	$ 63.36
Exercisable (in dollars per share)	$ 54.51
Weighted Average Remaining Contractual Life
Outstanding, weighted average remaining contractual life (in years)	5 years 9 months 18 days	5 years 8 months 12 days
Exercisable weighted average remaining contractual life (in years)	4 years 6 months
Aggregate Intrinsic Value
Beginning balance	$ 8.5
Ending balance	3.7	$ 8.5
Exercisable	$ 3.7

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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