Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

	For the Three Months Ended   March 31,
	2019		2018
Sales to do-it-yourself customers	$	1,337,029	$	1,272,414
Sales to professional service provider customers	1,038,781		975,009
Other sales and sales adjustments	34,798		35,258
Total sales	$	2,410,608	$	2,282,681