Details of Certain Balance Sheet Accounts (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Receivables, net [Abstract]
Trade accounts	$ 26,681	$ 18,533
Vendor programs	50,302	44,842
Other, net	3,511	2,112
Total receivables	80,494	65,487
Less allowance for doubtful accounts	(3,897)	(4,050)
Receivables, net	76,597	61,437
Prepaid expenses and other current assets [Abstract]
Prepaid expenses	14,700	13,584
Other current assets	4,869	1,734
Prepaid expenses and other current assets	19,569	15,318
Property and equipment, net [Abstract]
Land	3,003	1,685
Buildings	4,255	2,465
Leasehold improvements	41,908	38,348
Autos and trucks	70,570	53,371
Machinery and equipment	55,128	45,535
Computer equipment	38,194	39,251
Furniture and fixtures	9,670	9,951
Fixed assets in progress	1,072	2,065
Total property and equipment	223,800	192,671
Less accumulated depreciation	(122,861)	(109,381)
Property and equipment, net	100,939	83,290
Accrued expenses and other current liabilities [Abstract]
Salaries and payroll deductions	9,987	8,878
Performance-based compensation	31,807	32,226
Taxes payable	7,970	8,424
Other current liabilities	15,718	14,859
Accrued expenses and other current liabilities	$ 65,482	$ 64,387