Business Combinations - Salveo Specialty Pharmacy Acquisiton (Details) (USD $)
 0 Months Ended
Jan. 02, 2015
Mar. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill   $ 4,923,665,000 $ 4,724,639,000
Salveo Specialty Pharmacy, Inc [Member]      
Business Acquisition [Line Items]      
Purchase price 270,599,000    
Preliminary post-closing adjustments 9,485,000    
Purchase price 280,084,000    
Cash 8,931,000    
Accounts receivable 32,622,000    
Inventory 9,421,000    
Other current assets 10,919,000    
Total current assets 61,893,000    
Intangible assets 64,900,000    
Goodwill 199,026,000    
Other long term assets 972,000    
Total assets acquired 326,791,000    
Accounts payable 28,656,000    
Accrued liabilities 840,000    
Total current liabilities 29,496,000    
Deferred income taxes 17,211,000    
Total liabilities assumed 46,707,000    
Net assets acquired 280,084,000    
Trademarks and Trade Names [Member] | Salveo Specialty Pharmacy, Inc [Member]      
Business Acquisition [Line Items]      
Intangible assets 26,500,000    
Acquired intangible assets, useful life 10 years    
Customer relationships [Member] | Salveo Specialty Pharmacy, Inc [Member]      
Business Acquisition [Line Items]      
Intangible assets 37,100,000    
Acquired intangible assets, useful life 5 years    
Non-compete agreements [Member] | Salveo Specialty Pharmacy, Inc [Member]      
Business Acquisition [Line Items]      
Intangible assets 1,000,000    
Acquired intangible assets, useful life 5 years    
License [Member] | Salveo Specialty Pharmacy, Inc [Member]      
Business Acquisition [Line Items]      
Intangible assets $ 300,000    
Acquired intangible assets, useful life 1 year