Equity-Based Compensation - Summary of Outstanding Equity-Based Awards (Detail) - shares shares in Thousands	Apr. 01, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested options, outstanding	2,505	4,226
Unvested options, outstanding	233	464
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based awards other than options, outstanding	692	449
PSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based awards other than options, outstanding	380	231
RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based awards other than options, outstanding	226	353

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.

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

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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

Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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

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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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