Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
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, 2016
Mar. 31, 2015
Concentration Risk [Line Items]    
Percentage of total production 55.90% 58.30%
Manufacturer One [Member]    
Concentration Risk [Line Items]    
Percentage of total production 26.40% 34.40%
Manufacturer Two [Member]    
Concentration Risk [Line Items]    
Percentage of total production 11.10% 8.40%
Manufacturer Three [Member]    
Concentration Risk [Line Items]    
Percentage of total production 10.50% 6.90%
Manufacturer Four [Member]    
Concentration Risk [Line Items]    
Percentage of total production 4.40% 4.50%
Manufacturer Five [Member]    
Concentration Risk [Line Items]    
Percentage of total production 3.50% 4.10%