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Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jan. 02, 2016
Dec. 27, 2014
Schedule Of Accrued Expenses [Line Items]    
Interest $ 19,591 $ 32,475
Payroll and benefits 24,714 20,326
Capital lease obligations 15,263 17,530
Insurance 9,824 11,402
Non-income taxes 4,618 5,520
Professional fees 2,528 3,299
Other 16,404 10,944
Total 92,942 101,496
Summit Materials, LLC [Member]    
Schedule Of Accrued Expenses [Line Items]    
Interest 19,591 32,475
Payroll and benefits 24,714 20,326
Capital lease obligations 15,263 17,530
Insurance 9,824 11,402
Non-income taxes 4,618 5,520
Professional fees 2,528 3,299
Other 16,404 10,944
Total $ 92,942 $ 101,496