Income Taxes - Reconciliation of Income Tax Computed at U.S. Federal Statutory Tax Rate to Provision (Benefit) for Income Taxes for Continuing Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Tax Disclosure [Abstract]
U.S. Federal statutory tax rate	35.00%	35.00%	35.00%
Tax benefit on stock-based compensation	$ 204	$ 0	$ 0