Percentage of restricted share awards that vest on each anniversary date from the date of grant.

No definition available.

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- Definition

The highest aggregate value of performance units an employee can be granted under the plan per period.

+ References

No definition available.

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- Definition

The highest dollar amount from their salary that an employee is permitted to utilize with respect to the plan.

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No definition available.

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- Definition

Minimum percentage of common stock price to grant date price of stock options to trigger vesting.

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No definition available.

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The maximum percentage that can be achieved under the predetermined performance thresholds for the performance based restricted share awards.

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No definition available.

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- Definition

The expected attainment percentage for the awards based upon actual and forecasted sales and operating income.

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No definition available.

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The maximum percentage that can be achieved under the predetermined performance thresholds for the performance shares.

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The minimum percentage that can be achieved under the predetermined performance thresholds for the performance shares.

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- Definition

The expected attainment percentage for the shareholder return awards based upon current stock performance.

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No definition available.

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Threshold period of specified consecutive trading days within which common stock price to grant date price of options must exceed threshold percentage for a specified number of trading days to vesting, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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- Definition

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

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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.

+ References

No definition available.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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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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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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Percentage of vesting of share-based compensation awards.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

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No definition available.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)		3 Months Ended			12 Months Ended
	Sep. 15, 2015	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 14, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under ESPP					148,520	158,194	188,453
Stock-based compensation expense					$ 20,360,000	$ 13,683,000	$ 43,613,000
Awards granted requisite service period					3 years
Incentive plan, weighted-average grant date fair value of stock options granted					$ 7.03	$ 6.24	$ 5.59
Incentive plan, total intrinsic value of stock options exercised					$ 15,800,000	$ 13,400,000	$ 6,800,000
Stock-based compensation expenses tax benefits					$ 0	1,700,000	14,300,000
Employee Stock Purchase Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance		3,000,000			3,000,000
Permitted designation for purchase of common stock under ESPP					Participating employees are permitted to designate up to the lesser of $25,000 or 10% of their annual base compensation for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter.
Employee participating annual base compensation designated for purchase of common stock, amount		$ 25,000			$ 25,000
Employee participating annual base compensation designated for purchase of common stock, percent		10.00%			10.00%
Price of common stock purchased under ESPP, percent					85.00%
Discount offered pursuant to ESPP, percentage					15.00%
Stock-based compensation expense					$ 500,000	$ 500,000	$ 500,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 1,900,000			$ 1,900,000
Unrecognized compensation costs, weighted-average recognition periods					10 months 24 days
Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							133.00%
Consecutive trading days							20 days
Share-based compensation, non-vested grant date fair value							$ 7.46
Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							167.00%
Consecutive trading days							20 days
Share-based compensation, non-vested grant date fair value							$ 7.06
Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							200.00%
Consecutive trading days							20 days
Share-based compensation, non-vested grant date fair value							$ 6.50
Restricted Share Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted requisite service period						3 years	3 years
Award vesting period						1 year
Number of shares vested					231,473
Shares withheld to pay employees' portion of minimum payroll withholding taxes					41,973
Award vesting percentage for each year					33.00%	33.00%	33.00%
Unrecognized compensation costs		2,500,000			$ 2,500,000
Unrecognized compensation costs, weighted-average recognition periods					1 year 2 months 12 days
Performance-Based Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year 3 months 18 days
Number of shares vested					173,636
Shares withheld to pay employees' portion of minimum payroll withholding taxes					64,699
Threshold level percentage for share awards				150.00%				150.00%
Performance-Based Restricted Share Awards [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage							90.40%
Restricted share awards, vesting increments on anniversary dates of grants								33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share awards, vesting increments on anniversary dates of grants								33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Two [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				98.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Two [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				100.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share awards, vesting increments on anniversary dates of grants								33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Three [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				98.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Three [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				100.00%
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares vested					10,000
Unrecognized compensation costs		$ 10,800,000			$ 10,800,000
Unrecognized compensation costs, weighted-average recognition periods					2 years 1 month 6 days
Restricted share awards, vesting increments on anniversary dates of grants					33.00%
2015 Grant [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage			0.00%
2015 Grant [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage			100.00%
2016 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage			65.00%
2016 Grant [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		0.00%
2016 Grant [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		65.00%
2017 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage			100.00%
2016 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance		8,000,000			8,000,000
2016 Incentive Plan [Member] \| Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units and Other Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of Common Stock a participant may receive					3,000,000
2016 Incentive Plan [Member] \| Performance Shares or Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum aggregate value on the date of grant					$ 9,000,000
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock reserved for issuance									23,250,000
LTIP Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 3,800,000			$ 3,800,000
Unrecognized compensation costs, weighted-average recognition periods					1 year 2 months 12 days
Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation awards, award payout range, maximum		200.00%	200.00%		200.00%	200.00%	200.00%
Stock based compensation awards, award payout range, minimum					0.00%	0.00%	0.00%
Unrecognized compensation costs		$ 13,200,000			$ 13,200,000
Unrecognized compensation costs, weighted-average recognition periods					2 years