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Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) (Production Concentration Of Top Five Manufacturers [Member])
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3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 63.40% | 64.20% | 60.10% | 63.10% |
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Manufacturer One [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 41.10% | 33.70% | 36.50% | 34.30% |
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Manufacturer Two [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 8.20% | 11.00% | 8.00% | 9.80% |
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Manufacturer Three [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 5.00% | 7.20% | 5.70% | 6.70% |
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Manufacturer Four [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 4.80% | 6.50% | 5.50% | 6.60% |
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Manufacturer Five [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 4.30% | 5.80% | 4.40% | 5.70% |