Intangbile assets (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	$ 32,100,000	$ 28,100,000	$ 28,000,000
Indefinite Lived Intangible Assets	92,002,000	92,002,000
Finite Lived Intangible Assets	601,732,000	318,421,000
Accumulated Amortization	(105,070,000)	(73,021,000)
Total Intangible assets, less accumulated amortization	588,664,000	337,402,000
Future Amortization Expense, Year One	47,400,000
Future Amortization Expense, Year Two	46,700,000
Future Amortization Expense, Year Three	41,400,000
Future Amortization Expense, Year Four	40,000,000
Future Amortization Expense, Year Five	37,200,000
Trade Names [Member]
Intangible Assets [Line Items]
Indefinite Lived Intangible Assets	92,002,000	92,002,000
Routes [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets	259,326,000	61,951,000
Accumulated Amortization	(38,231,000)	(27,681,000)
Permits [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets	321,763,000	251,550,000
Accumulated Amortization	(63,145,000)	(43,209,000)
Non-compete agreements [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets	7,218,000	3,654,000
Accumulated Amortization	(2,352,000)	(1,525,000)
Trade Names [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets	12,698,000	539,000
Accumulated Amortization	(724,000)	(73,000)
Royalty, consulting and leasehold [Member]
Intangible Assets [Line Items]
Finite Lived Intangible Assets	727,000	727,000
Accumulated Amortization	$ (618,000)	$ (533,000)