Business Combinations - Additional Information (Details) (USD $)	0 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended		0 Months Ended	6 Months Ended			0 Months Ended			6 Months Ended	0 Months Ended	6 Months Ended		0 Months Ended
	Aug. 30, 2013 Segment	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2012 Multiband Federal	Dec. 31, 2012 Multiband State	Sep. 30, 2013 Selling, General and Administrative Costs	Jun. 30, 2014 Selling, General and Administrative Costs	Jun. 30, 2013 Selling, General and Administrative Costs	Feb. 28, 2013 CSG	Jun. 30, 2014 CSG	Jun. 30, 2014 CSG Selling, General and Administrative Costs	Jun. 30, 2013 CSG Selling, General and Administrative Costs	Feb. 28, 2013 CSG Minimum	Feb. 28, 2013 CSG Maximum	Aug. 08, 2013 DBT	Jun. 30, 2014 DBT	Aug. 30, 2013 Multiband Segment	Jun. 30, 2014 Multiband	Jun. 30, 2013 Multiband	Aug. 30, 2013 Multiband Minimum	Aug. 30, 2013 Multiband Maximum
Business Acquisition [Line Items]
Date of acquisition										Feb. 28, 2013						Aug. 08, 2013	Aug. 30, 2013
Percentage of interest in acquired entity									100.00%						100.00%
Payment made in cash to acquire business									$ 18,000,000						$ 1,306,000		$ 101,092,000
Period measured to determine contingent consideration payments										3 years						18 months
Term of contingent consideration payments										3 years						18 months
Contingent consideration, range of payments, Minimum									0						0
Contingent consideration, range of payments, Maximum									17,000,000						900,000
Fair value of contingent consideration									9,163,000						741,000
Gross contractual accounts receivable									7,400,000								28,400,000
Fair value of acquired receivables									7,400,000								28,000,000
Discount rate													18.50%	23.00%						9.50%	11.50%
Business combination, acquisition related costs							0	1,400,000		700,000	0	400,000						3,800,000	3,800,000
Acquisition costs capitalized										0								0
Reporting units assigned acquired intangible assets																	2
Reporting units	4
Net operating loss carry forwards				47,500,000	46,000,000
Share-based compensation expense		$ 2,045,000	$ 2,343,000			$ 1,400,000