Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Information
Net sales	$ 348,519	$ 352,526	$ 1,052,108	$ 1,038,897
Gross profit (loss)	49,585	48,392	147,674	143,669
Depreciation and amortization expense	2,987	3,116	8,884	9,418
Operating profit (loss)	4,145	3,993	13,313	7,547
Total consolidated assets	350,568		350,568		365,735
Commercial
Segment Information
Net sales	252,590	247,956	761,331	756,202
Gross profit (loss)	39,605	37,071	117,876	112,321
Depreciation and amortization expense	978	1,207	3,038	3,592
Operating profit (loss)	15,649	14,488	47,405	43,845
Public Sector
Segment Information
Net sales	55,691	52,672	147,907	119,272
Gross profit (loss)	5,342	5,342	13,550	12,799
Depreciation and amortization expense	15	25	44	87
Operating profit (loss)	1,768	1,943	3,649	1,739
MacMall
Segment Information
Net sales	40,240	51,903	142,938	163,456
Gross profit (loss)	4,687	5,887	16,312	18,450
Depreciation and amortization expense	221	244	649	776
Operating profit (loss)	250	765	1,343	1,838
Corporate and Other
Segment Information
Net sales	(2)	(5)	(68)	(36)
Gross profit (loss)	(49)	92	(64)	99
Depreciation and amortization expense	1,773	1,640	5,153	4,963
Operating profit (loss)	$ (13,522)	$ (13,203)	$ (39,084)	$ (39,875)