Accrued Expenses - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Schedule Of Accrued Expenses [Line Items]
Interest	$ 18,341	$ 22,991
Payroll and benefits	18,217	30,546
Capital lease obligations	17,396	11,766
Insurance	11,047	11,966
Non-income taxes	7,714	5,491
Professional fees	2,244	2,459
Other	25,761	26,386
Total	100,720	111,605
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
Interest	18,341	22,991
Payroll and benefits	18,217	30,546
Capital lease obligations	17,396	11,766
Insurance	11,047	11,966
Non-income taxes	7,714	5,491
Professional fees	2,244	2,459
Other	25,761	25,254
Total	$ 100,720	$ 110,473