Business Combinations Restat (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jul. 02, 2012
Revolving Credit Facility [Member]
Oct. 01, 2013
Restat [Member]
Sep. 30, 2014
Restat [Member]
Sep. 30, 2014
Restat [Member]
Oct. 01, 2013
Restat [Member]
Oct. 01, 2013
Restat [Member]
Customer Relationship - PBM [Member]
Oct. 01, 2013
Restat [Member]
Customer Relationship - PBM [Member]
Oct. 01, 2013
Restat [Member]
Customer Relationship, Cash Cards [Member]
Oct. 01, 2013
Restat [Member]
Customer Relationship, Cash Cards [Member]
Oct. 01, 2013
Restat [Member]
Trademarks and Trade Names [Member]
Oct. 01, 2013
Restat [Member]
Trademarks and Trade Names [Member]
Oct. 01, 2013
Restat [Member]
Non-compete agreements [Member]
Oct. 01, 2013
Restat [Member]
Non-compete agreements [Member]
Oct. 01, 2013
Restat [Member]
Initial Amounts Recognized at Acquisition Date [Member]
Jun. 30, 2014
Restat [Member]
Measurement Period Adjustments [Member]
Oct. 01, 2013
Restat [Member]
Current Amounts Recognized at Acquisition Date [Member]
Oct. 01, 2013
Restat [Member]
Revolving Credit Facility [Member]
Business Acquisition [Line Items]                                            
Purchase price             $ 409,500,000                              
Debt amount                                           350,000,000
Term of long-term debt           5 years                               5 years
Goodwill expected to be tax deductible                   227,800,000                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]                                            
Accounts receivable                                     13,842,000 [1] 0 [2] 13,842,000  
Rebates receivable                                     6,635,000 [1] (254,000) [2] 6,381,000  
Other current assets                                     383,000 [1] 0 [2] 383,000  
Total current assets                                     20,860,000 [1] (254,000) [2] 20,606,000  
Property and equipment                                     1,263,000 [1] 0 [2] 1,263,000  
Intangible assets                   182,720,000   143,200,000   35,500,000   1,000,000   3,020,000 182,720,000 [1] 0 [2] 182,720,000  
Goodwill 4,724,639,000   4,724,639,000   4,720,275,000                           223,474,000 [1] 4,364,000 [2] 227,838,000  
Total assets acquired                                     428,317,000 [1] 4,110,000 [2] 432,427,000  
Accounts payable                                     22,370,000 [1] 0 [2] 22,370,000  
Rebates payable                                     16,106,000 [1] 0 [2] 16,106,000  
Accrued liabilities                                     7,231,000 [1] 0 [2] 7,231,000  
Other long-term liabilities                                     0 [1] 2,084,000 [2] 2,084,000  
Total liabilities assumed                                     45,707,000 [1] 2,084,000 [2] 47,791,000  
Net assets acquired                                     382,610,000 [1] 2,026,000 [2] 384,636,000  
Measurement period adjustment paid to former Restat owners                                       2,000,000    
Amortization of intangible assets 52,216,000 47,220,000 162,179,000 147,368,000       8,700,000 26,000,000                          
Future amortization expense, remainder of 2014 $ 51,000,000   $ 51,000,000         $ 7,700,000 $ 7,700,000                          
Acquired intangible assets, useful life                     10 years   3 years   1 year   5 years          
[1] As previously reported in the Company's Form 10-K for the period ended December 31, 2013.
[2] These measurement period adjustments were recorded through June 30, 2014 to reflect an additional $2.0 million paid to former Restat owners for working capital reconciliation as well as changes in the estimated fair values of the associated assets acquired and liabilities assumed based on factors existing as of the acquisition date.