Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment	Dec. 31, 2013 segment	Dec. 31, 2012
Segment Information
Number of Operating Segments									3us-gaap_NumberOfOperatingSegments	4us-gaap_NumberOfOperatingSegments
Segment Information
Net sales	$ 359,233us-gaap_SalesRevenueNet	$ 336,801us-gaap_SalesRevenueNet	$ 334,991us-gaap_SalesRevenueNet	$ 325,337us-gaap_SalesRevenueNet	$ 357,191us-gaap_SalesRevenueNet	$ 335,811us-gaap_SalesRevenueNet	$ 350,002us-gaap_SalesRevenueNet	$ 316,995us-gaap_SalesRevenueNet	$ 1,356,362us-gaap_SalesRevenueNet	$ 1,359,999us-gaap_SalesRevenueNet	$ 1,342,298us-gaap_SalesRevenueNet
Gross profit	50,187us-gaap_GrossProfit	45,199us-gaap_GrossProfit	47,976us-gaap_GrossProfit	48,705us-gaap_GrossProfit	48,143us-gaap_GrossProfit	47,910us-gaap_GrossProfit	49,113us-gaap_GrossProfit	44,333us-gaap_GrossProfit	192,067us-gaap_GrossProfit	189,499us-gaap_GrossProfit	184,130us-gaap_GrossProfit
Depreciation and amortization expense									11,893	11,830	12,496
Operating profit									15,705us-gaap_OperatingIncomeLoss	18,220us-gaap_OperatingIncomeLoss	13,618us-gaap_OperatingIncomeLoss
Total consolidated assets	389,190us-gaap_Assets				434,822us-gaap_Assets				389,190us-gaap_Assets	434,822us-gaap_Assets
Commercial
Segment Information
Net sales									1,016,047	1,034,776	1,026,222
Gross profit									158,777	158,157	151,783
Depreciation and amortization expense									2,416	3,911	4,630
Operating profit									58,029	63,486	59,571
Public Sector
Segment Information
Net sales									214,723	187,142	165,828
Gross profit									21,057	16,995	16,514
Depreciation and amortization expense									45	73	106
Operating profit									8,349	3,714	2,554
MacMall
Segment Information
Net sales									125,615	138,089	150,290
Gross profit									12,211	14,344	15,506
Depreciation and amortization expense									116	82	69
Operating profit									1,290	2,968	4,048
Corporate and Other
Segment Information
Net sales									(23)	(8)	(42)
Gross profit									22	3	327
Depreciation and amortization expense									8,070	6,980	6,768
Operating profit									(51,963)	(51,948)	(52,555)
Continuing operations
Segment Information
Net sales									1,356,362	1,359,999	1,342,298
Gross profit									192,067	189,499	184,130
Depreciation and amortization expense									10,647	11,046	11,573
Operating profit									$ 15,705	$ 18,220	$ 13,618