Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

	For the Three Months Ended   September 30,				For the Nine Months Ended   September 30,
	2019		2018		2019		2018
Sales to do-it-yourself customers	$	1,473,514	$	1,408,140	$	4,244,689	$	4,053,137
Sales to professional service provider customers	1,151,721		1,040,728		3,303,987		3,058,127
Other sales and sales adjustments	41,293		33,849		118,334		110,207
Total sales	$	2,666,528	$	2,482,717	$	7,667,010	$	7,221,471