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Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Income Tax Contingency [Line Items]
Unrecognized tax benefit at beginning of fiscal year	$ 8,709	$ 4,823	$ 4,629
Gross increases - tax positions in a current period	331	876	553
Gross increases - acquisitions		3,863
Lapses of statutes of limitations	(1,736)	(853)	(359)
Unrecognized tax benefit at end of fiscal year	$ 7,304	$ 8,709	$ 4,823

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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