Allocated share based compensation expense (income).

No definition available.

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- Definition

Number of shares withheld to satisfy tax obligations.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options vested during period.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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- Definition

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.

+ References

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

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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).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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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.

+ References

No definition available.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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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.

+ References

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- Definition

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

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- Definition

Number of shares issued under share-based payment arrangement.

+ References

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

+ References

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- Definition

Number of options vested.

+ References

No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,539,000		1,539,000		1,489,000
Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested	$ 4.5
Unrecognized compensation expense expected to be recognized			2 years 10 months 24 days
Restricted stock units outstanding	130,000		130,000		132,000
Share-settled restricted stock units vested	5,975
Number of shares withheld to satisfy tax obligations	2,012
Shares issued	3,963
Granted, weighted average grant date fair value (in dollars per share)	$ 249.20	$ 747.77
Unrecognized share-based compensation expense	$ 41.7		$ 41.7
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested	15,625
Aggregate fair value of stock option vested	$ 0.7
Weighted average grant date fair value of stock option awards	$ 153.74	$ 334.40
Share-based compensation expense recognized	$ 12.7	$ 8.9	35.4	$ 23.0
Unrecognized share-based compensation expense	141.4		$ 141.4
Unrecognized compensation expense expected to be recognized			2 years 10 months 24 days
2013 Equity Plan \| Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 3.6	2.4	$ 10.0	5.0
Restricted stock units outstanding	129,969		129,969
2013 Equity Plan \| Other Stock Based Awards and Cash Settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense expected to be recognized			2 years 4 months 24 days
Unrecognized share-based compensation expense	$ 0.5		$ 0.5
Share-based compensation expense (income) recognized	$ 0.2	0.3	$ (0.4)	1.2
2013 Equity Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	2,750,000		2,750,000
Shares of class A common stock reserved and available for future issuance	121,221		121,221
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,539,279		1,539,279
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 0.5	$ 0.6	$ 1.6	$ 1.8
Unrecognized compensation expense expected to be recognized			4 months 24 days
Unrecognized share-based compensation expense	$ 1.3		$ 1.3
2021 Employee Stock Purchase Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	100,000		100,000
Shares of class A common stock reserved and available for future issuance	79,463		79,463
Common stock, shares issued	8,475