Number of non-management members.

No definition available.

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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.

+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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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

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).

+ References

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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

Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

+ References

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Topic 505
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-SubTopic 10
-Section S99
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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Stock Based-Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	May 17, 2018 Members $ / shares shares	Mar. 02, 2018 $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jul. 01, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised			694,423		780,972
Weighted average exercise price of options exercised \| $ / shares			$ 2.00		$ 2.00
Compensation expense for stock based awards \| $			$ 700	$ 600	$ 1,198	$ 1,037
Total unrecognized compensation cost related primarily to restricted share awards \| $			$ 3,700		$ 3,700
Weighted average remaining period of stock option					1 year 8 months 12 days
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards	30,456
Fair value of common stock \| $ / shares	$ 18.65
Number of non management members \| Members	8
Restricted Stock Award [Member] \| Executives and Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards		139,182
Fair value of common stock \| $ / shares		$ 18.40
Company Performance Criteria [Member] \| Executives and Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards		69,591
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance criteria defined in share awards					The performance percentages, ranging from less than 80% to greater than 120%, provide for the awarding of shares ranging from no shares to 150% of the original number of shares.
Fixed Criteria [Member] \| Executives and Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards		69,591
Options vesting period		3 years