Rebranding Strategy and Cost Reduction Initiatives (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rebranding strategy and cost reduction initiatives
Approximate entity size (annual sales)	$ 1,400,000,000
Severance and restructuring related expenses	0	2,283,000	2,898,000
Commercial
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		1,330,000	1,440,000
Public Sector
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		385,000	19,000
MacMall
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		21,000	137,000
Corporate and Other
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		547,000	1,302,000
Employee termination costs
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		694,000	1,675,000
Summary of rollforward of restructuring costs
Balance at the beginning of the period	140,000	212,000
Costs Charged to Expense		694,000	1,675,000
Payments	(140,000)	(766,000)	(1,463,000)
Balance at the end of the period		140,000	212,000
Employee termination costs | Commercial
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		214,000	566,000
Employee termination costs | Public Sector
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		34,000	19,000
Employee termination costs | MacMall
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		16,000	137,000
Employee termination costs | Corporate and Other
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		430,000	953,000
Accelerated trademark amortization costs
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		916,000	874,000
Accelerated trademark amortization costs | Commercial
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		916,000	874,000
Other costs
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		673,000	349,000
Summary of rollforward of restructuring costs
Balance at the beginning of the period		43,000
Costs Charged to Expense		673,000	349,000
Payments		(716,000)	(306,000)
Balance at the end of the period			43,000
Other costs | Commercial
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		200,000
Other costs | Public Sector
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		351,000
Other costs | MacMall
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		5,000
Other costs | Corporate and Other
Rebranding strategy and cost reduction initiatives
Severance and restructuring related expenses		$ 117,000	$ 349,000