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Income Taxes - Components of Income Tax Benefit (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Provision for income taxes:      
Current $ 1,605 $ (906) $ 1,761
Deferred (19,868) (6,077) (4,408)
Income tax benefit (18,263) (6,983) (2,647)
Summit Materials, LLC [Member]      
Provision for income taxes:      
Current 1,605 (905) 1,761
Deferred (19,868) (6,078) (4,408)
Income tax benefit $ (18,263) $ (6,983) $ (2,647)