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General – Impact of Adoption of ASC 606 on Consolidated Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating results by business segment    
Net revenue $ 1,805,077 $ 1,305,623
Income before income taxes 11,377 29,275
Provision (benefit) for income taxes (75) 11,806
Net income 11,452 17,469
Net income attributable to Magellan 11,452 17,747
Managed care and other    
Operating results by business segment    
Net revenue 1,219,763 729,340
PBM    
Operating results by business segment    
Net revenue 585,314 $ 576,283
ASU 2014-09 | Adjustments    
Operating results by business segment    
Net revenue 3,695  
Income before income taxes 3,695  
Provision (benefit) for income taxes 964  
Net income 2,731  
Net income attributable to Magellan 2,731  
ASU 2014-09 | Adjustments | Managed care and other    
Operating results by business segment    
Net revenue (2,755)  
ASU 2014-09 | Adjustments | PBM    
Operating results by business segment    
Net revenue 6,450  
ASU 2014-09 | Balance Without ASC 606 Adoption    
Operating results by business segment    
Net revenue 1,808,772  
Income before income taxes 15,072  
Provision (benefit) for income taxes 889  
Net income 14,183  
Net income attributable to Magellan 14,183  
ASU 2014-09 | Balance Without ASC 606 Adoption | Managed care and other    
Operating results by business segment    
Net revenue 1,217,008  
ASU 2014-09 | Balance Without ASC 606 Adoption | PBM    
Operating results by business segment    
Net revenue $ 591,764