Unaudited Condensed Consolidated Statement of Partners' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2016	Jun. 28, 2015	Jun. 26, 2016	Jun. 28, 2015
Statement of Partners' Capital [Abstract]
Foreign currency translation adjustment, tax	$ 1,414	$ 1,011	$ 3,934	$ (3,136)
Unrealized loss on cash flow hedging derivatives, tax			$ 92	$ 185
Partnership distribution declared, amount per limited partnership unit (in dollars per share)	$ 1.65	$ 1.50	$ 1.65	$ 1.50