Business Segment Information - Identifiable Assets by Business Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment reporting information
Restricted cash	$ 133,597	$ 215,325	$ 236,696
Net accounts receivable	428,644	353,713	238,185
Investments	326,165	267,654	208,313
Pharmaceutical inventory	50,749	39,375	49,609
Goodwill	621,390	566,106	488,206
Other intangible assets, net	133,374	133,718	69,694
Pharmacy Management
Segment reporting information
Goodwill	360,772	311,636
Operating segments | Healthcare
Segment reporting information
Restricted cash	133,597	213,681	221,758
Net accounts receivable	153,036	170,488	120,752
Investments	313,045	142,957	109,457
Goodwill	260,618	254,470	245,916
Other intangible assets, net	12,227	10,840	11,789
Operating segments | Pharmacy Management
Segment reporting information
Net accounts receivable	270,975	180,535	115,527
Pharmaceutical inventory	50,749	39,375	49,609
Goodwill	360,772	311,636	242,290
Other intangible assets, net	121,147	122,878	57,905
Corporate and Elimination
Segment reporting information
Restricted cash		1,644	14,938
Net accounts receivable	4,633	2,690	1,906
Investments	$ 13,120	$ 124,697	$ 98,856