Stock Based Compensation - Summary of Restricted Shares, Performance Share Units, and Restricted Share Units (Detail)	9 Months Ended
Sep. 29, 2018 $ / shares shares
Restricted shares
Number of Unvested Shares
Unvested at beginning of period (in shares) \| shares	724,104
Granted (in shares) \| shares	287,439
Vested (in shares) \| shares	(147,814)
Canceled/forfeited (in shares) \| shares	(372,570)
Unvested at end of period (in shares) \| shares	491,159
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share) \| $ / shares	$ 18.65
Granted (in dollars per share) \| $ / shares	4.63
Vested (in dollars per share) \| $ / shares	22.75
Canceled/forfeited (in dollars per share) \| $ / shares	15.26
Unvested at end of period (in dollars per share) \| $ / shares	$ 11.79
Performance share units
Number of Unvested Shares
Unvested at beginning of period (in shares) \| shares	288,365
Granted (in shares) \| shares	650,910
Vested (in shares) \| shares	0
Canceled/forfeited (in shares) \| shares	(485,870)
Unvested at end of period (in shares) \| shares	453,405
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share) \| $ / shares	$ 22.43
Granted (in dollars per share) \| $ / shares	6.00
Vested (in dollars per share) \| $ / shares	0.00
Canceled/forfeited (in dollars per share) \| $ / shares	11.39
Unvested at end of period (in dollars per share) \| $ / shares	$ 10.67
Restricted share units
Number of Unvested Shares
Unvested at beginning of period (in shares) \| shares	39,708
Granted (in shares) \| shares	160,560
Vested (in shares) \| shares	(67,843)
Canceled/forfeited (in shares) \| shares	(23,723)
Unvested at end of period (in shares) \| shares	108,702
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share) \| $ / shares	$ 11.90
Granted (in dollars per share) \| $ / shares	7.45
Vested (in dollars per share) \| $ / shares	9.68
Canceled/forfeited (in dollars per share) \| $ / shares	6.85
Unvested at end of period (in dollars per share) \| $ / shares	$ 7.82

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

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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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 (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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

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)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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

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)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ 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 (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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+ References

No definition available.

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- Definition

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

+ 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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 (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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