Deadline for vesting of shares.

No definition available.

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- Definition

Number of publicly traded companies.

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No definition available.

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- Definition

Number of trading day.

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No definition available.

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- Definition

Percentage of PSUs eligible to vest.

+ References

No definition available.

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- Definition

Performance period commencement date.

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No definition available.

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- Definition

Performance period maturity date.

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No definition available.

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- Definition

Performance share units. Each PSU granted under the LTIP represents a notional share of the Company's common stock.

+ References

No definition available.

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- Definition

VWAP Share Price.

+ 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

Amount of cost capitalized for award under share-based payment arrangement.

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- Definition

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

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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No definition available.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Feb. 28, 2021 TradingDay Company shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)
Software and Capitalized Software Costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Capitalized compensation cost \| $		$ 1.5	$ 1.6
Restricted Stock [Member] \| Share Based Compensation Award V W A P Equals Or Exceeds Five Twenty Per Share \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		50.00%
VWAP Share Price \| $ / shares		$ 520
Restricted Stock [Member] \| Share Based Compensation Award V W A P Equals Or Exceeds Six Hundred Per Share \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		50.00%
VWAP Share Price \| $ / shares		$ 600
Restricted Stock [Member] \| First Tranche [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		21.00%
Restricted Stock [Member] \| Second Tranche [Member \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		21.00%
Restricted Stock [Member] \| Second Anniversary [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		25.00%
Restricted Stock [Member] \| Third Anniversary [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Vesting percentage, restricted shares		33.00%
Restricted Stock [Member] \| LTIP [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted shares of common stock issued		145,416
Restricted Stock [Member] \| LTIP [Member] \| Market-Based Shares [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted shares of common stock issued		42,912
Restricted Stock [Member] \| LTIP [Member] \| Time-Based Shares [Member] \| Non Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted shares of common stock issued		102,504
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted shares of common stock issued		52,500
Performance Shares [Member] \| LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of trading day \| TradingDay	60
Number of publicly traded companies \| Company	34
Performance Shares [Member] \| LTIP [Member] \| Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Performance share units	52,470
Performance Shares [Member] \| LTIP [Member] \| Executive Officers [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Performance share units	131,176
Performance Shares [Member] \| LTIP [Member] \| Two-Year Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Performance period commencement date	Jan. 01, 2021
Performance period maturity date	Dec. 31, 2022
Percentage of PSUs eligible to vest	25.00%
Deadline for vesting of shares	Mar. 01, 2023
Performance Shares [Member] \| LTIP [Member] \| Three-Year Performance Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Performance period commencement date	Jan. 01, 2021
Performance period maturity date	Dec. 31, 2023
Percentage of PSUs eligible to vest	75.00%
Deadline for vesting of shares	Feb. 29, 2024
Restricted Stock Awards and PSU Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based compensation expense \| $		$ 23.6	$ 15.8