Additional common stock units for election of deferred annual incentive award, percentage.

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- Definition

Age for eligible employee.

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Amount of annual incentive award payment participant can elect to defer.

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- Definition

Fraction of restricted stock award vesting on anniversary.

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No definition available.

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- Definition

Installments in which restricted stock units vest and are converted to common stock.

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- Definition

Number of anniversaries of grant date upon which restricted stock units vest.

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No definition available.

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- Definition

Stock option exercise price as percentage of market value.

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- Definition

The period in which a stock option can be exercised.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

Aggregate number of common shares reserved for future issuance.

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

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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- Definition

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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- 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

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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-Publisher FASB
-Name Accounting Standards Codification
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Stock-Based Compensation - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Anniversaries Installment shares	Apr. 01, 2017 USD ($)	May 08, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant	100.00%
Compensation expenses for stock options	$ 0.4	$ 0.3
Omnibus Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation, common stock available for grant \| shares	7.3		13.0
Inactive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance \| shares	2.1
Restricted Stock [Member] \| LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary	0.333%
Eligible age of officer for restricted stock award	55 years
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 29.2
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 10 months 24 days
Number of anniversaries of grant date upon which restricted stock units vest \| Anniversaries	3
Installments in which restricted stock units vest and are converted to common stock \| Installment	3
Compensation expense	$ 5.7	5.0
Restricted Stock Units [Member] \| AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible age of officer for restricted stock award	55 years
Amount of annual incentive award payment participant can elect to defer	50.00%
Additional common stock units for election of deferred annual incentive award, percentage	25.00%
Restricted Stock And Restricted Stock Units [Member] \| AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock	$ 2.7
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	2 years 2 months 12 days
Compensation expense	$ 4.4	$ 4.3
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period	3 years
Stock options term, years	10 years
Unrecognized compensation expense related to stock	$ 1.8
Weighted-average recognition period for unrecognized compensation expense related to stock (years)	1 year 9 months 18 days