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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 | |
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Mar. 31, 2014
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Mar. 31, 2013
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 58.30% | 58.50% |
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Manufacturer One [Member]
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 36.80% | 31.10% |
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Manufacturer Two [Member]
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 5.80% | 8.80% |
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Manufacturer Three [Member]
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 5.40% | 8.10% |
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Manufacturer Four [Member]
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 5.30% | 5.50% |
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Manufacturer Five [Member]
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| Concentration Risk [Line Items] | ||
| Percentage of total production | 5.00% | 5.00% |