Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 25, 2016 USD ($)	Dec. 27, 2015 USD ($)
Redeemable Noncontrolling Interests
Number of joint ventures under which noncontrolling interest holders have the option to require the Company to purchase their interests | item	2
Changes in redeemable noncontrolling interests
Balance at the beginning of the period	$ 8,461
Net income	2,195	$ 3,665	$ 3,873
Distributions to noncontrolling interests	(2,949)	(2,610)	(2,550)
Change in redemption value	(1,419)	(567)	(65)
Balance at the end of the period	6,738	8,461
Joint ventures
Changes in redeemable noncontrolling interests
Balance at the beginning of the period	8,461	8,363
Net income	2,195	3,665
Distributions to noncontrolling interests	(2,499)	(3,000)
Change in redemption value	(1,419)	(567)
Balance at the end of the period	$ 6,738	$ 8,461	$ 8,363