Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2017	Dec. 31, 2016
Property, plant and equipment, accumulated depreciation, depletion and amortization	$ 518,554	$ 484,554
Intangible assets, accumulated amortization	5,700	7,854
Summit Materials, LLC
Property, plant and equipment, accumulated depreciation, depletion and amortization	518,554	484,554
Intangible assets, accumulated amortization	$ 5,700	$ 7,854
Common Class A
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	106,403,740	96,033,222
Common stock, shares outstanding	106,403,740	96,033,222
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	100	100
Common stock, shares outstanding	100	100