Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail)

v3.20.2
Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) - Cost of Goods, Total [Member] - Supplier Concentration Risk [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Concentration Risk [Line Items]        
Percentage of total production 44.70% 41.70% 45.10% 41.10%
Manufacturer One [Member]        
Concentration Risk [Line Items]        
Percentage of total production 20.20% 15.40% 23.40% 15.80%
Manufacturer Two [Member]        
Concentration Risk [Line Items]        
Percentage of total production 8.00% 8.30% 7.00% 8.80%
Manufacturer Three [Member]        
Concentration Risk [Line Items]        
Percentage of total production 6.10% 7.00% 5.90% 6.60%
Manufacturer Four [Member]        
Concentration Risk [Line Items]        
Percentage of total production 5.70% 5.70% 4.50% 5.00%
Manufacturer Five [Member]        
Concentration Risk [Line Items]        
Percentage of total production 4.70% 5.30% 4.30% 4.90%