Number Of New Employees To Whom PAY.ON RSAs were granted.

No definition available.

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- Definition

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

+ References

No definition available.

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Data Type:	num:percentItemType
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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.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

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

+ References

No definition available.

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Number of Shares Authorized, Prior to Amendment

+ References

No definition available.

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- Definition

Extension of the term of the employee stock purchase plan.

+ References

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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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

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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Number of vesting tranches for share based compensation awards with share-price and service vesting requirements.

+ References

No definition available.

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The attainment percentage expected to vest for the defined awards.

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No definition available.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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

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 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

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.

+ References

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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.

+ References

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Data Type:	num:percentItemType
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- Definition

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

+ References

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Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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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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- Definition

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

+ References

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

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

+ References

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- Definition

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).

+ References

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Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

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Data Type:	xbrli:monetaryItemType
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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.

+ References

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Data Type:	num:perShareItemType
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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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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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Data Type:	num:perShareItemType
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- Definition

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

+ References

No definition available.

+ Details

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Stock-Based Compensation Plans - Additional Information (Detail)		3 Months Ended				12 Months Ended
	Sep. 15, 2015	Dec. 31, 2017 USD ($) shares	Mar. 31, 2017	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2017 USD ($) Employee $ / shares shares	Dec. 31, 2016 USD ($) Tranche $ / shares shares	Dec. 31, 2015 USD ($) Tranche $ / shares shares	Jun. 14, 2012 shares	Jul. 24, 2007 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under ESPP						158,194	188,453	162,058
Stock-based compensation expense \| $						$ 13,683,000	$ 43,613,000	$ 18,380,000
Shares of common stock reserved for issuance prior to amendment		9,000,000				9,000,000
Incentive plan, weighted-average grant date fair value of stock options granted \| $ / shares						$ 6.24	$ 5.59	$ 6.49
Incentive plan, total intrinsic value of stock options exercised \| $						$ 13,400,000	$ 6,800,000	$ 12,400,000
Expected dividend yield						0.00%
Dividend paid \| $ / shares						$ 0
Number of tranches \| Tranche							3	3
Stock-based compensation expenses tax benefits \| $						$ 1,700,000	$ 14,300,000	$ 6,900,000
Employee Stock Purchase Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized		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 \| $		$ 8,200,000				$ 8,200,000
Unrecognized compensation costs, weighted-average recognition periods						1 year 6 months
Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							133.00%	133.00%
Consecutive trading days							20 days	20 days
Share-based compensation, non-vested grant date fair value \| $ / shares							$ 7.46	$ 8.01
Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							167.00%	167.00%
Consecutive trading days							20 days	20 days
Share-based compensation, non-vested grant date fair value \| $ / shares							$ 7.06	$ 7.56
Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, trading price percentage							200.00%	200.00%
Consecutive trading days							20 days	20 days
Share-based compensation, non-vested grant date fair value \| $ / shares							$ 6.50	$ 7.00
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	3 years
Restricted share awards, vesting increments on anniversary dates of grants						33.00%	33.00%	33.00%
Award vesting period						1 year
Total stock based compensation awards, shares vested						120,869	114,219	158,973
Shares withheld to pay employees' portion of minimum payroll withholding taxes						3,311	9,062	25,235
Unrecognized compensation costs \| $		6,900,000				$ 6,900,000
Unrecognized compensation costs, weighted-average recognition periods						1 year 10 months 25 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 19 days							3 years
Total stock based compensation awards, shares vested						484,835	169,567
Shares withheld to pay employees' portion of minimum payroll withholding taxes						178,351	59,659
Threshold level percentage for share awards								150.00%
Award grants assuming percentage								100.00%
Unrecognized compensation costs \| $		$ 600,000				$ 600,000
Unrecognized compensation costs, weighted-average recognition periods						4 months 24 days
Performance-Based Restricted Share Awards [Member] \| Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year							90.40%	33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year								33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Two [Member] \| Minimum
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
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]
Award vesting percentage for each year								33.00%
Performance-Based Restricted Share Awards [Member] \| Tranche Three [Member] \| Minimum
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage			100.00%
Retention RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation awards, shares vested						205,540	226,526
Shares withheld to pay employees' portion of minimum payroll withholding taxes						75,198	76,421
Retention RSAs [Member] \| Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							1 year 3 months 19 days
Retention RSAs [Member] \| Employees other than Named Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period							9 months 18 days
Retention RSAs [Member] \| Tranche One [Member] \| Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year							50.00%
Retention RSAs [Member] \| Tranche One [Member] \| Employees other than Named Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year							50.00%
Retention RSAs [Member] \| Tranche Two [Member] \| Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year							50.00%
Retention RSAs [Member] \| Tranche Two [Member] \| Employees other than Named Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage for each year							50.00%
PAY.ON RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted requisite service period						2 years
Restricted share awards, vesting increments on anniversary dates of grants						25.00%
Total stock based compensation awards, shares vested						119,188	238,374
Number of employees to whom awards issued \| Employee						2
2011 Grant [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage					91.00%
2011 Grant [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage					100.00%
2013 Grant [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				0.00%
2013 Grant [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage				75.00%
2015 Grant [Member] \| Minimum
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		100.00%
2016 Grant [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		65.00%
2016 Grant [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		100.00%
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]
Number of shares authorized		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]
Number of shares authorized									23,250,000	15,000,000
Employee stock purchase plan term						10 years
2005 Stock Incentive Plan [Member] \| 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
2005 Stock Incentive Plan [Member] \| 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
2005 Stock Incentive Plan [Member] \| 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
LTIP Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum attainment percentage that may be achieved for LTIP Performance Shares		200.00%				200.00%	200.00%	200.00%
Total stock based compensation awards, shares vested								548,671
Shares withheld to pay employees' portion of minimum payroll withholding taxes								196,169
Unrecognized compensation costs \| $		$ 11,600,000				$ 11,600,000
Unrecognized compensation costs, weighted-average recognition periods						1 year 10 months 25 days
LTIP Performance Shares [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						1 year	1 year	1 year
LTIP Performance Shares [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years	3 years	3 years
Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum attainment percentage that may be achieved for LTIP Performance Shares		200.00%				200.00%
Stock based compensation awards, award payout range, minimum						0.00%
Unrecognized compensation costs \| $		$ 2,500,000				$ 2,500,000
Unrecognized compensation costs, weighted-average recognition periods						2 years 1 month 6 days
Total Shareholder Return [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		64.00%
Total Shareholder Return [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected attainment level for the awards granted, percentage		100.00%