Condensed Consolidating Financial Statements Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Current assets        
Cash and cash equivalents $ 906,835 $ 387,241 $ 436,227 $ 370,776
Restricted cash 32,224 32,220    
Accounts receivable, net 1,296,245 959,586    
Rebates receivable 880,117 305,955    
Other current assets 176,987 152,673    
Intercompany receivable 0 0    
Total current assets 3,292,408 1,837,675    
Property and equipment, net 188,728 197,007    
Goodwill 4,724,639 4,720,275    
Other intangible assets, net 1,019,240 1,181,419    
Investment in subsidiaries 0 0    
Other long-term assets 74,250 59,387    
Total assets 9,299,265 7,995,763 7,492,886  
Current liabilities        
Accounts payable 1,105,771 817,805    
Accrued expenses and other current liabilities 313,398 254,100    
Rebates payable 915,035 356,265    
Current portion - long-term debt 75,000 50,000    
Intercompany payable 0 0    
Total current liabilities 2,409,204 1,478,170    
Deferred income taxes 259,311 301,341    
Long-term debt 1,362,202 1,215,363    
Other long-term liabilities 97,336 89,391    
Total liabilities 4,128,053 3,084,265    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 5,162,951 4,908,490    
Non-controlling interest 8,261 3,008    
Total equity 5,171,212 4,911,498 4,832,663 4,609,861
Total liabilities and equity 9,299,265 7,995,763    
Reportable Legal Entities [Member] | Catamaran Corporation [Member]
        
Current assets        
Cash and cash equivalents 238,095 15,090 15,462 33,603
Restricted cash 0 0    
Accounts receivable, net 275 194    
Rebates receivable 10,698 35,777    
Other current assets 134 107    
Intercompany receivable 235,851 130,743    
Total current assets 485,053 181,911    
Property and equipment, net 95 69    
Goodwill 0 0    
Other intangible assets, net 0 0    
Investment in subsidiaries 6,105,884 5,980,865    
Other long-term assets 14,858 15,674    
Total assets 6,605,890 6,178,519    
Current liabilities        
Accounts payable 0 0    
Accrued expenses and other current liabilities 4,336 2,947    
Rebates payable 0 0    
Current portion - long-term debt 75,000 50,000    
Intercompany payable 0 0    
Total current liabilities 79,336 52,947    
Deferred income taxes 0 0    
Long-term debt 1,362,202 1,215,363    
Other long-term liabilities 1,401 1,719    
Total liabilities 1,442,939 1,270,029    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 5,162,951 4,908,490    
Non-controlling interest 0 0    
Total equity 5,162,951 4,908,490    
Total liabilities and equity 6,605,890 6,178,519    
Reportable Legal Entities [Member] | Guarantors [Member]
        
Current assets        
Cash and cash equivalents 605,182 350,889 390,595 303,833
Restricted cash 27,388 27,384    
Accounts receivable, net 1,288,324 954,006    
Rebates receivable 868,643 473,924    
Other current assets 129,285 114,808    
Intercompany receivable 0 0    
Total current assets 2,918,822 1,921,011    
Property and equipment, net 147,633 188,676    
Goodwill 4,641,174 4,636,810    
Other intangible assets, net 1,002,933 1,160,205    
Investment in subsidiaries 142,927 105,947    
Other long-term assets 44,400 30,144    
Total assets 8,897,889 8,042,793    
Current liabilities        
Accounts payable 1,134,918 840,055    
Accrued expenses and other current liabilities 284,510 200,071    
Rebates payable 1,005,692 612,173    
Current portion - long-term debt 0 0    
Intercompany payable 146,870 232,124    
Total current liabilities 2,571,990 1,884,423    
Deferred income taxes 254,009 296,040    
Long-term debt 0 0    
Other long-term liabilities 70,611 86,600    
Total liabilities 2,896,610 2,267,063    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 6,001,279 5,775,730    
Non-controlling interest 0 0    
Total equity 6,001,279 5,775,730    
Total liabilities and equity 8,897,889 8,042,793    
Reportable Legal Entities [Member] | Non-Guarantors [Member]
        
Current assets        
Cash and cash equivalents 63,558 21,262 30,170 33,340
Restricted cash 4,836 4,836    
Accounts receivable, net 94,432 61,319    
Rebates receivable 144,499 92,227    
Other current assets 47,568 16,785    
Intercompany receivable 0 125,888    
Total current assets 354,893 322,317    
Property and equipment, net 41,000 8,262    
Goodwill 83,465 83,465    
Other intangible assets, net 16,307 21,214    
Investment in subsidiaries 37,072 0    
Other long-term assets 21,884 59,932    
Total assets 554,621 495,190    
Current liabilities        
Accounts payable 97,220 37,251    
Accrued expenses and other current liabilities 31,097 28,403    
Rebates payable 53,066 40,065    
Current portion - long-term debt 0 0    
Intercompany payable 12,350 0    
Total current liabilities 193,733 105,719    
Deferred income taxes 5,302 5,301    
Long-term debt 0 0    
Other long-term liabilities 25,324 23,651    
Total liabilities 224,359 134,671    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 329,017 359,274    
Non-controlling interest 1,245 1,245    
Total equity 330,262 360,519    
Total liabilities and equity 554,621 495,190    
Consolidations [Member]
        
Current assets        
Cash and cash equivalents 0 0 0 0
Restricted cash 0 0    
Accounts receivable, net (86,786) (55,933)    
Rebates receivable (143,723) (295,973)    
Other current assets 0 20,973    
Intercompany receivable (235,851) (256,631)    
Total current assets (466,360) (587,564)    
Property and equipment, net 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Investment in subsidiaries (6,285,883) (6,086,812)    
Other long-term assets (6,892) (46,363)    
Total assets (6,759,135) (6,720,739)    
Current liabilities        
Accounts payable (126,367) (59,501)    
Accrued expenses and other current liabilities (6,545) 22,679    
Rebates payable (143,723) (295,973)    
Current portion - long-term debt 0 0    
Intercompany payable (159,220) (232,124)    
Total current liabilities (435,855) (564,919)    
Deferred income taxes 0 0    
Long-term debt 0 0    
Other long-term liabilities 0 (22,579)    
Total liabilities (435,855) (587,498)    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity (6,330,296) (6,135,004)    
Non-controlling interest 7,016 1,763    
Total equity (6,323,280) (6,133,241)    
Total liabilities and equity $ (6,759,135) $ (6,720,739)