Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, beginning balance	$ (1,133)	$ (417)	$ (883)
Deferred pension and other post-retirement benefit costs, net of taxes	130	(734)	407
Amortization of Deferred benefit costs, net of tax	74	18	59
Currency translation adjustment	(22)
Accumulated other comprehensive (loss) income, ending balance	$ (951)	$ (1,133)	$ (417)