Quarterly report pursuant to Section 13 or 15(d)

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

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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Concentration Risk [Line Items]        
Percentage of total production 59.70% 61.70% 60.40% 58.90%
Manufacturer One [Member]        
Concentration Risk [Line Items]        
Percentage of total production 41.20% 41.20% 41.40% 38.00%
Manufacturer Two [Member]        
Concentration Risk [Line Items]        
Percentage of total production 8.40% 6.40% 7.60% 5.70%
Manufacturer Three [Member]        
Concentration Risk [Line Items]        
Percentage of total production 3.50% 5.10% 4.90% 5.50%
Manufacturer Four [Member]        
Concentration Risk [Line Items]        
Percentage of total production 3.30% 4.60% 3.40% 5.30%
Manufacturer Five [Member]        
Concentration Risk [Line Items]        
Percentage of total production 3.30% 4.40% 3.10% 4.40%