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Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from option exercises	$ 4,100,000	$ 27,300,000	$ 21,100,000
Tax benefit realized from stock options exercised	1,100,000	4,800,000	5,500,000
Intrinsic value of options exercised	900,000	6,900,000	8,100,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2,500,000
Unrecognized compensation cost, recognition period (in years)	1 year 6 months
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 20,700,000
Unrecognized compensation cost, recognition period (in years)	4 years 3 months 18 days
Fair value, vested	$ 9,900,000	$ 10,400,000	14,600,000
Employees awards, granted (in shares)	289,000
Employees awards, outstanding (in shares)	933,000	941,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 300,000
Unrecognized compensation cost, recognition period (in years)	8 months 12 days
Fair value, vested	$ 1,900,000	$ 2,400,000	4,400,000
Released intrinsic value	$ 4,100,000	$ 9,300,000	3,100,000
Employees awards, granted (in shares)	50,000
Employees awards, outstanding (in shares)	402,000	465,000
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 1,600,000
Unrecognized compensation cost, recognition period (in years)	10 months 24 days
Fair value, vested	$ 0	$ 0	$ 0
Employees awards, granted (in shares)	100,000
Employees awards, outstanding (in shares)	252,000	206,000
Omnibus Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)	1,714,952

X

- Definition

The intrinsic value of equity-based payment equity instruments, excluding stock options, that released during the reporting period as calculated by applying the disclosed pricing methodology.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation 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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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.

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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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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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