Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) - Cost of Goods, Total [Member] - Supplier Concentration Risk [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Concentration Risk [Line Items]        
Percentage of total production 45.00% 59.70% 52.20% 60.40%
Manufacturer One [Member]        
Concentration Risk [Line Items]        
Percentage of total production 19.00% 41.20% 23.80% 41.40%
Manufacturer Two [Member]        
Concentration Risk [Line Items]        
Percentage of total production 9.50% 8.40% 10.00% 7.60%
Manufacturer Three [Member]        
Concentration Risk [Line Items]        
Percentage of total production 8.30% 3.50% 9.50% 4.90%
Manufacturer Four [Member]        
Concentration Risk [Line Items]        
Percentage of total production 4.20% 3.30% 5.00% 3.40%
Manufacturer Five [Member]        
Concentration Risk [Line Items]        
Percentage of total production 4.00% 3.30% 3.90% 3.10%