Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Consolidated Statements of Stockholders' Equity (Deficit)
Income attributable to noncontrolling interests	$ 4,233	$ 6,272	$ 6,282
Accumulated other comprehensive income (loss)	(2,117)	(5,887)	(1,836)
Unrealized foreign currency translation gains (losses)	(2,523)	(5,402)	(411)
Net unrealized gain (loss) on the interest rate swap agreements	$ 406	$ (485)	$ (1,425)