Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 25, 2010
Deferred tax assets:
Accrued expenses	$ 2,424	$ 2,451
Stock-based compensation expense	6,059	4,573
Inventory	2,099	1,477
Other	2,340	2,105
Total deferred tax assets	12,922	10,606
Valuation allowance	(545)	(311)
Total deferred tax assets net of valuation allowance	12,377	10,295
Deferred tax liabilities:
Property, plant and equipment	(24,068)	(22,484)
Prepaid expenses	(907)	(900)
Goodwill	(388)	(350)
Total deferred tax liabilities	(25,363)	(23,734)
Net deferred tax liabilities	$ (12,986)	$ (13,439)