Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

	For the Three Months Ended   March 31,
	2018		2017
Sales to do-it-yourself customers	$	1,272,414	$	1,217,146
Sales to professional service provider customers	975,009		905,925
Other sales and sales adjustments	35,258		33,188
Total sales	$	2,282,681	$	2,156,259