Quarterly report pursuant to Section 13 or 15(d)

Business And Credit Concentrations - Company's Top Five Manufacturers Produced (Detail)

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Business And Credit Concentrations - Company's Top Five Manufacturers Produced (Detail)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Concentration Risk [Line Items]    
Total manufacturers produced 58.50% 61.30%
Company's Top Five Manufacturers Produced [Member]
    
Concentration Risk [Line Items]    
Manufacturer #1 31.10% 34.90%
Manufacturer #2 8.80% 8.80%
Manufacturer #3 8.10% 7.70%
Manufacturer #4 5.50% 5.00%
Manufacturer #5 5.00% 4.90%