Details of Certain Balance Sheet Accounts (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Receivables, net [Abstract]
Trade accounts	$ 17,835	$ 17,558
Vendor incentives	38,444	35,894
Other, net	2,099	1,570
Total receivables	58,378	55,022
Less allowance for doubtful accounts	(4,205)	(4,008)
Receivables, net	54,173	51,014
Prepaid expenses and other current assets [Abstract]
Prepaid expenses	11,919	11,535
Other current assets	27	124
Prepaid expenses and other current assets	11,946	11,659
Property and equipment, net [Abstract]
Land	1,925	1,775
Buildings	2,465	1,868
Leasehold improvements	33,518	30,361
Autos and trucks	35,832	25,829
Machinery and equipment	39,518	36,001
Computer equipment	39,271	36,417
Furniture and fixtures	9,164	9,266
Fixed assets in progress	6,173	4,090
Total property and equipment	167,866	145,607
Less accumulated depreciation	(98,012)	(89,132)
Property and equipment, net	69,854	56,475
Accrued expenses and other current liabilities [Abstract]
Salaries and payroll deductions	6,433	6,659
Incentive compensation	29,090	27,296
Taxes payable	8,889	7,425
Other	12,179	12,705
Accrued expenses and other current liabilities	$ 56,591	$ 54,085