Business Combinations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015		Dec. 31, 2014
Business Acquisition [Line Items]
Estimated fair value of contingent consideration liability	$ 2,414	[1]	$ 0
Business Combination, period to realize additional earnings-based contingent consideration	12 months
ForwardThink [Member]
Business Acquisition [Line Items]
Date of acquisition	Feb. 10, 2014
Cash paid for acquisition	$ 26,900
Common stock issued	13,200
Transaction costs	1,300
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized - Cash Incentive Plan	$ 800
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Period of Recognition Incentive Plan	3 years
Total purchase price	$ 40,100
ForwardThink [Member] | Minimum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	11 months
ForwardThink [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	6 years
BioPharm [Member]
Business Acquisition [Line Items]
Date of acquisition	Apr. 01, 2014
Cash paid for acquisition	$ 11,200
Common stock issued	5,100
Transaction costs	700
Total purchase price	$ 16,300
BioPharm [Member] | Minimum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	9 months
BioPharm [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	10 years
Trifecta [Member]
Business Acquisition [Line Items]
Date of acquisition	May 07, 2014
Cash paid for acquisition	$ 8,200
Common stock issued
Transaction costs	$ 600
Total purchase price	$ 13,600
Trifecta [Member] | Minimum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	8 months
Trifecta [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	5 years
Zeon [Member]
Business Acquisition [Line Items]
Date of acquisition	Jan. 02, 2015
Cash paid for acquisition	$ 22,900
Common stock issued	11,400
Estimated fair value of contingent consideration liability	2,200
Transaction costs	900
Total purchase price	$ 36,500
Zeon [Member] | Minimum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	9 months
Zeon [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible assets estimated useful life	8 years

[1] Represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Zeon's selling shareholders 12 months after the Zeon acquisition.