Income Taxes - Change in Uncertain Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 2,301	$ 3,567	$ 1,855
Reductions due to lapses in statutes of limitations	(95)	(181)
Reductions due to tax positions settled	(368)	(4,543)	(109)
Reductions due to reversals of prior year positions	(4)		(212)
Additions based on tax positions taken during the prior period		3,005
Additions based on tax positions taken during the current period	556	453	2,033
Balance at end of year	$ 2,390	$ 2,301	$ 3,567

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.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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

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