Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Plan, common stock available for issuance	6,000,000
Incentive Plan, options vesting period	3 years
Incentive Plan, options maturity period	10 years
Incentive Plan, weighted-average grant date fair value of stock options granted	$ 13.49	$ 12.70	$ 11.58
Unrecognized compensation cost related to unvested option	$ 6.0
Fair value of options vested	6.8	$ 6.0	$ 7.8
Intrinsic value of stock options exercised	$ 70.6	88.1	78.0
Performance Condition Achievement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance share awards vested	100,580
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs classified as liability	$ 0.6
Unrecognized pre-tax compensation cost	$ 18.9
Unrecognized compensation cost, weighted-average recognition period	1 year 6 months
Fair value of performance share awards vested	$ 20.3	$ 16.4	$ 24.9
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, weighted-average recognition period	1 year 4 months 24 days
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pre-tax compensation cost	$ 6.8
Unrecognized compensation cost, weighted-average recognition period	1 year 3 months 19 days
Fair value of performance share awards vested	$ 5.6
Number of performance share awards vested	95,183
Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards issued	15,311	16,471	19,695
Common stock issued to outside directors	$ 63.43	$ 57.37	$ 46.21

Share Based Compensation Arrangement By Share Based Payment Award Stock Based Award Weighted Average Fair Value

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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

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

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

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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