Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Number of Award Shares

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Amount of noncash expense for option under share-based payment arrangement.

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Stock compensation plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of common stock authorized to be issued under plan (in shares)	5,300,000
Number of options granted (in shares)	130,206
Unrecognized compensation expense	$ 30.4
Shares available for future grants (in shares)	3,183,199
Stock option granted, weighted average grant date fair value (in dollars per share)	$ 74.60	$ 68.22	$ 58.16
Stock option granted, weighted average grant date fair value	$ 77.9	$ 64.3	$ 69.4
Stock option expenses including selling general and administrative expenses	$ 9.4
Non-vested restricted stock units issued (in shares)	52,464	69,799	62,221
Non vested restricted stock expense including selling general and administrative expense	$ 14.8
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options granted (in shares)	130,206
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	52,464
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 9.4
Period for recognition	1 year 5 months 12 days
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 16.2
Period for recognition	1 year 2 months 12 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	52,464
Weighted average grant date fair value (in dollars per share)	$ 344.70	$ 286.51	$ 250.66
Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period	3 years
Weighted average grant date fair value (in dollars per share)		$ 362.78
2014 Plan \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1
2014 Plan \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1.8
Prior Plans Before December 31, 2013 \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1
Prior Plans Before December 31, 2013 \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1.8
Prior Plans After January 1, 2014 \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1
Prior Plans After January 1, 2014 \| Stock Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of award shares (in shares)	1.8
Minimum \| Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	25,818
Maximum \| Performance Shares Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of restricted stock awards (in shares)	64,562