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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 1, 2019, the Company acquired certain assets of Builders’ Supplies Limited II and all of the shares of 2168828 Alberta Inc. and 2168829 Alberta Inc. (collectively, "BSL"). BSL was an independent distributor of specialty building products including wallboard, metal framing, suspended ceiling systems and insulation in the commercial market. BSL operated three branches in the Greater Toronto Area in Ontario, Canada. Any adjustments to the purchase price allocation of this acquisition will be made as soon as practicable but no later than one year from the acquisition date.