Accrued Expenses - Components of Accrued Expenses (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Schedule Of Accrued Expenses [Line Items]
Interest	$ 24,311	$ 22,991
Payroll and benefits	25,197	30,546
Capital lease obligations	19,838	11,766
Insurance	13,249	11,966
Non-income taxes	10,226	5,491
Professional fees	2,420	2,459
Other	24,019	26,386
Total	119,260	111,605
Summit Materials, LLC
Schedule Of Accrued Expenses [Line Items]
Interest	24,311	22,991
Payroll and benefits	25,197	30,546
Capital lease obligations	19,838	11,766
Insurance	13,249	11,966
Non-income taxes	10,226	5,491
Professional fees	2,420	2,459
Other	24,019	25,254
Total	$ 119,260	$ 110,473