Summary of Significant Accounting Policies - Contingent Consideration (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Apr. 01, 2015	Dec. 31, 2014	Jul. 01, 2014	Apr. 30, 2014
Fair value measurement of contingent consideration
Fair value of the short term contingent consideration			$ 91,623		$ 8,314
Fair value of the long term contingent consideration			803		49,839
Fair value of the contingent consideration	$ 58,153	$ 58,153	92,426		58,153
Liability for contingent consideration
Balance as of beginning of period	58,153
Changes in fair value: Increase (Decrease) in contingent consideration	44,257	9,304
Payments	(29,274)
Balance as of end of period	92,426	58,153
Direct service costs and other operating expenses
Liability for contingent consideration
Changes in fair value: Increase (Decrease) in contingent consideration	$ 44,300	6,200
Interest expense
Liability for contingent consideration
Changes in fair value: Increase (Decrease) in contingent consideration		3,100
CDMI
Contingent consideration disclosures
Maximum potential contingent payments							$ 165,000
Fair value measurement of contingent consideration
Fair values inputs - Discount Rate (as a percent)	0.33%
Estimated undiscounted future contingent payments			90,100		65,700
Fair value of the short term contingent consideration			89,900
Liability for contingent consideration
Acquisition		45,778
Changes in fair value: Increase (Decrease) in contingent consideration	$ 34,300
Payments	$ (9,900)
CDMI | Minimum
Fair value measurement of contingent consideration
Fair value inputs - Probability Of Payment (as a percent)	0.00%
CDMI | Maximum
Fair value measurement of contingent consideration
Fair value inputs - Probability Of Payment (as a percent)	100.00%
Cobalt
Contingent consideration disclosures
Maximum potential contingent payments						$ 6,000
Fair value measurement of contingent consideration
Fair values inputs - Discount Rate (as a percent)	14.50%
Estimated undiscounted future contingent payments			1,700		$ 4,200
Fair value of the short term contingent consideration			700
Fair value of the long term contingent consideration			800
Liability for contingent consideration
Acquisition		$ 3,071
Changes in fair value: Increase (Decrease) in contingent consideration	$ (2,200)
Payments	$ (300)
Cobalt | Minimum
Fair value measurement of contingent consideration
Fair value inputs - Probability Of Payment (as a percent)	2.00%
Cobalt | Maximum
Fair value measurement of contingent consideration
Fair value inputs - Probability Of Payment (as a percent)	33.00%
4D Pharmacy Management Systems, Inc.
Contingent consideration disclosures
Maximum potential contingent payments				$ 30,000
Fair value measurement of contingent consideration
Fair values inputs - Discount Rate (as a percent)	0.14%
Fair value inputs - Probability Of Payment (as a percent)	100.00%
Estimated undiscounted future contingent payments			1,000	$ 20,600
Net increase or decrease in contingent consideration liability	$ (19,600)
Fair value of the short term contingent consideration			$ 1,000
Liability for contingent consideration
Acquisition	19,290
Changes in fair value: Increase (Decrease) in contingent consideration	(600)
Payments	$ (19,000)