Income Taxes - Aggregate Changes in Balance of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 15,148us-gaap_UnrecognizedTaxBenefits	$ 13,902us-gaap_UnrecognizedTaxBenefits	$ 13,066us-gaap_UnrecognizedTaxBenefits
Tax position related to current year
Additions	1,990	1,676	1,437
Tax positions related to prior years
Additions	140	32	75
Reductions	(76)	(132)	(580)
Lapses of statute of limitations	(224)	(330)	(96)
Ending balance	$ 16,978us-gaap_UnrecognizedTaxBenefits	$ 15,148us-gaap_UnrecognizedTaxBenefits	$ 13,902us-gaap_UnrecognizedTaxBenefits

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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-Publisher FASB

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase 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 lapses of applicable statutes of limitations.

+ References

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