Business Combinations (Details) - USD ($) $ in Thousands				3 Months Ended		6 Months Ended
		Oct. 01, 2014	Jun. 16, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Total revenue				$ 156,259	$ 139,388	$ 303,252	$ 267,010
Goodwill, purchase accounting adjustments						(1,581)
ECBU [Member]
Business Acquisition [Line Items]
Total revenue				69,385	60,143	136,299	115,968
Goodwill, purchase accounting adjustments	[1]					(1,581)
GMBU [Member]
Business Acquisition [Line Items]
Total revenue				76,138	$ 67,029	146,067	$ 128,159
Goodwill, purchase accounting adjustments						0
MicroEdge [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition		$ 159,800
Total revenue				7,400		$ 14,000
Estimated fair value of accounts receivable acquired		6,300
Finite-lived intangible assets acquired		90,200
MicroEdge [Member] | ECBU [Member]
Business Acquisition [Line Items]
Goodwill, tax deductible amount		37,400
Goodwill, purchase accounting adjustments				1,600
WhippleHill [Member]
Business Acquisition [Line Items]
Total cash consideration paid for the acquisition			$ 35,000
Estimated fair value of accounts receivable acquired			4,600
Finite-lived intangible assets acquired			22,200
Net tangible assets acquired and liabilities assumed			3,500
WhippleHill [Member] | GMBU [Member]
Business Acquisition [Line Items]
Goodwill, purchase accounting adjustments				$ 0
Goodwill additions related to business combinations			$ 9,300
Revolving Credit Facility [Member] | MicroEdge [Member]
Business Acquisition [Line Items]
Proceeds from lines of credit		$ 140,000

[1] See Note 3 to these consolidated financial statements for details of the adjustments related to business combinations.