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Revenue Recognition - Contract Assets and Liabilities (Details)
$ in Thousands
9 Months Ended
Sep. 29, 2018
USD ($)
Change in Contract with Customer, Asset [Abstract]  
Beginning balance $ 9,512
Changes in revenue billed, contract price or cost estimates 37,643
Acquisitions 483
Other (9)
Ending balance 47,629
Change in Contract with Customer, Liability [Abstract]  
Beginning balance 15,750
Changes in revenue billed, contract price or cost estimates (3,850)
Acquisitions 1,179
Other (7)
Ending balance 13,072
Summit Materials, LLC  
Change in Contract with Customer, Asset [Abstract]  
Beginning balance 9,512
Changes in revenue billed, contract price or cost estimates 37,643
Acquisitions 483
Other (9)
Ending balance 47,629
Change in Contract with Customer, Liability [Abstract]  
Beginning balance 15,750
Changes in revenue billed, contract price or cost estimates (3,850)
Acquisitions 1,179
Other (7)
Ending balance $ 13,072