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Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) (Cost of Goods, Total [Member], Supplier Concentration Risk [Member])
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 61.70% | 63.40% | 58.90% | 60.10% |
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Manufacturer One [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 41.20% | 41.10% | 38.00% | 36.50% |
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Manufacturer Two [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 6.40% | 8.20% | 5.70% | 8.00% |
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Manufacturer Three [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 5.10% | 5.00% | 5.50% | 5.70% |
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Manufacturer Four [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 4.60% | 4.80% | 5.30% | 5.50% |
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Manufacturer Five [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 4.40% | 4.30% | 4.40% | 4.40% |