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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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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 59.90% | 61.60% | 62.50% |
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Manufacturer One [Member]
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 37.80% | 33.50% | 30.80% |
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Manufacturer Two [Member]
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 7.10% | 9.20% | 11.50% |
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Manufacturer Three [Member]
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 6.10% | 6.70% | 7.70% |
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Manufacturer Four [Member]
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 4.80% | 6.60% | 6.60% |
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Manufacturer Five [Member]
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| Concentration Risk [Line Items] | |||
| Percentage of total production | 4.10% | 5.60% | 5.90% |