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Net Earnings Per Share - Schedule of Basic to Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Reconciliation of basic to diluted loss per share        
Net income (loss) attributable to Summit Inc. $ 79,052 $ 44,820 $ 76,608 $ 37,073
Add: Noncontrolling interest impact of LP Unit conversion       3,745
Diluted net income attributable to Summit Inc. $ 79,052 $ 44,820 $ 76,608 $ 40,818
Number of Summit LP units purchased by Company, newly issued units (in shares)     1,255,266  
LP Units        
Reconciliation of basic to diluted loss per share        
Add: weighted average of LP Units       38,293,384
Anti dilutive shares excluded from calculation of earnings per share 4,039,020 26,731,747 4,560,976  
Stock options        
Reconciliation of basic to diluted loss per share        
Add: Share-based payment arrangements 926,613   184,875 181,961
Anti dilutive shares excluded from calculation of earnings per share   5,017,664    
Warrants        
Reconciliation of basic to diluted loss per share        
Add: warrants 39,555 17,368 42,094 11,639
Restricted stock units        
Reconciliation of basic to diluted loss per share        
Add: Share-based payment arrangements 220,531 100,876 285,088 225,786
Performance stock units        
Reconciliation of basic to diluted loss per share        
Add: Share-based payment arrangements 92,658 28,066 117,491 79,947
Common Class A        
Reconciliation of basic to diluted loss per share        
Weighted average shares of Class A common stock outstanding 108,024,055 74,433,487 106,698,076 62,686,433
Basic income (loss) per share $ 0.73 $ 0.60 $ 0.72 $ 0.59
Weighted average dilutive shares outstanding 109,303,412 74,579,797 107,327,624 101,479,150
Diluted earnings per share $ 0.72 $ 0.60 $ 0.71 $ 0.40
Summit Materials, LLC        
Reconciliation of basic to diluted loss per share        
Net income (loss) attributable to Summit Inc. $ 82,574 $ 61,268 $ 81,633 $ 40,819