Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) - Cost of Goods, Total [Member] - Supplier Concentration Risk [Member]
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Concentration Risk [Line Items]    
Percentage of total production 53.30% 55.90%
Manufacturer One [Member]    
Concentration Risk [Line Items]    
Percentage of total production 22.80% 26.40%
Manufacturer Two [Member]    
Concentration Risk [Line Items]    
Percentage of total production 10.90% 11.10%
Manufacturer Three [Member]    
Concentration Risk [Line Items]    
Percentage of total production 9.40% 10.50%
Manufacturer Four [Member]    
Concentration Risk [Line Items]    
Percentage of total production 5.60% 4.40%
Manufacturer Five [Member]    
Concentration Risk [Line Items]    
Percentage of total production 4.60% 3.50%