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Revenue (Tables)
6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of revenue
 
For the Three Months Ended 
 June 30,
 
For the Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Sales to do-it-yourself customers
$
1,372,583

 
$
1,307,898

 
$
2,644,997

 
$
2,525,044

Sales to professional service provider customers
1,042,390

 
946,256

 
2,017,399

 
1,852,181

Other sales and sales adjustments
41,100

 
36,675

 
76,358

 
69,863

Total sales
$
2,456,073

 
$
2,290,829

 
$
4,738,754

 
$
4,447,088