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Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 07, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to issue grants (in shares)			26,963,150
Shares available for grant (in shares)	3,422,052
Tax benefits recorded on stock based compensation	$ 37.3	$ 48.6	$ 35.0
Aggregate intrinsic value of options exercisable	$ 451.9
Weighted average remaining contractual term of options exercisable (in years)	5 years 3 months 18 days
Weighted-average remaining contractual life for options outstanding (in years)	6 years 3 months 4 days
Shares, granted (in shares)	107,000	238,000	152,000
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to issue grants (in shares)	30,463,150	26,963,150
Shares, granted (in shares)	0	0	0
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to issue grants (in shares)	13,250,000			16,750,000

X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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 difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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