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Business and Credit Concentrations - Company's Top Five Manufacturers Produced (Detail) (Supplier Concentration Risk [Member])
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 57.70% | 60.40% | 57.90% | 58.60% |
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Manufacturer One [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 35.80% | 34.50% | 36.30% | 33.20% |
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Manufacturer Two [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 7.10% | 7.40% | 6.30% | 7.90% |
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Manufacturer Three [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 6.00% | 7.30% | 5.70% | 6.70% |
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Manufacturer Four [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 4.90% | 6.60% | 5.30% | 5.90% |
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Manufacturer Five [Member]
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| Concentration Risk [Line Items] | ||||
| Percentage of total production | 3.90% | 4.60% | 4.30% | 4.90% |