Income Taxes - Reconciliation of Uncertain Tax Positions Excluding Accrued Interest (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 29, 2019	Dec. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance - gross uncertain tax positions	$ 2,283	$ 2,857	$ 2,286
Increase as a result of tax positions taken in the current year	61	60	571
Increase as a result of tax positions taken in a prior year	504	0	0
Reduction as a result of the expiration of the applicable statute of limitations	(687)	(634)	0
Ending balance - gross uncertain tax positions	$ 2,161	$ 2,283	$ 2,857

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

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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