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Acquisitions - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Estimated amortization expense          
2017 (three months) $ 321   $ 321    
2018 1,265   1,265    
2019 1,259   1,259    
2020 1,176   1,176    
2021 1,134   1,134    
2022 1,104   1,104    
Thereafter 10,736   10,736    
Total 16,995   16,995   $ 17,989
Amortization expense 300 $ 600 1,000 $ 2,100  
Summit Materials, LLC          
Estimated amortization expense          
2017 (three months) 321   321    
2018 1,265   1,265    
2019 1,259   1,259    
2020 1,176   1,176    
2021 1,134   1,134    
2022 1,104   1,104    
Thereafter 10,736   10,736    
Total 16,995   16,995   $ 17,989
Amortization expense $ 300 $ 600 $ 1,000 $ 2,100