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Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Cash payments:    
Interest $ 75,990 $ 59,179
Income taxes 1,516 1,345
Non cash financing activities:    
Purchase of noncontrolling interest in Continental Cement (29,102)  
Summit Materials, LLC [Member]    
Cash payments:    
Interest 75,990 59,179
Income taxes 1,516 $ 1,345
Non cash financing activities:    
Purchase of noncontrolling interest in Continental Cement $ (64,102)