Condensed Consolidating Financial Statements Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Current assets        
Cash and cash equivalents $ 709,548 $ 387,241 $ 373,588 $ 370,776
Restricted cash 32,223 32,220    
Accounts receivable, net 1,173,606 959,586    
Rebates receivable 908,216 305,955    
Other current assets 219,519 152,673    
Intercompany receivable 0 0    
Total current assets 3,043,112 1,837,675    
Property and equipment, net 198,392 197,007    
Goodwill 4,724,639 4,720,275    
Other intangible assets, net 1,071,456 1,181,419    
Investment in subsidiaries 0 0    
Other long-term assets 80,287 59,387    
Total assets 9,117,886 7,995,763 7,347,812  
Current liabilities        
Accounts payable 1,000,760 817,805    
Accrued expenses and other current liabilities 275,576 254,100    
Rebates payable 942,857 356,265    
Current portion - long-term debt 68,750 50,000    
Intercompany payable 0 0    
Total current liabilities 2,287,943 1,478,170    
Deferred income taxes 276,664 301,341    
Long-term debt 1,379,432 1,215,363    
Other long-term liabilities 97,178 89,391    
Total liabilities 4,041,217 3,084,265    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 5,070,752 4,908,490    
Non-controlling interest 5,917 3,008    
Total equity 5,076,669 4,911,498 4,753,270 4,609,861
Total liabilities and equity 9,117,886 7,995,763    
Reportable Legal Entities [Member] | Catamaran Corporation [Member]
        
Current assets        
Cash and cash equivalents 260,944 15,090 19,999 33,603
Restricted cash 0 0    
Accounts receivable, net 218 194    
Rebates receivable 10,422 35,777    
Other current assets 268 107    
Intercompany receivable 169,821 130,743    
Total current assets 441,673 181,911    
Property and equipment, net 70 69    
Goodwill 0 0    
Other intangible assets, net 0 0    
Investment in subsidiaries 6,073,578 5,980,865    
Other long-term assets 15,836 15,674    
Total assets 6,531,157 6,178,519    
Current liabilities        
Accounts payable 29 0    
Accrued expenses and other current liabilities 10,402 2,947    
Rebates payable 0 0    
Current portion - long-term debt 68,750 50,000    
Intercompany payable 0 0    
Total current liabilities 79,181 52,947    
Deferred income taxes 0 0    
Long-term debt 1,379,432 1,215,363    
Other long-term liabilities 1,792 1,719    
Total liabilities 1,460,405 1,270,029    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 5,070,752 4,908,490    
Non-controlling interest 0 0    
Total equity 5,070,752 4,908,490    
Total liabilities and equity 6,531,157 6,178,519    
Reportable Legal Entities [Member] | Guarantors [Member]
        
Current assets        
Cash and cash equivalents 421,581 350,889 323,343 303,833
Restricted cash 27,387 27,384    
Accounts receivable, net 808,956 954,006    
Rebates receivable 1,504,529 473,924    
Other current assets 152,292 114,808    
Intercompany receivable 232,816 0    
Total current assets 3,147,561 1,921,011    
Property and equipment, net 156,598 188,676    
Goodwill 4,641,174 4,636,810    
Other intangible assets, net 1,053,528 1,160,205    
Investment in subsidiaries 129,117 105,947    
Other long-term assets 47,080 30,144    
Total assets 9,175,058 8,042,793    
Current liabilities        
Accounts payable 1,098,017 840,055    
Accrued expenses and other current liabilities 236,591 200,071    
Rebates payable 1,560,151 612,173    
Current portion - long-term debt 0 0    
Intercompany payable 0 232,124    
Total current liabilities 2,894,759 1,884,423    
Deferred income taxes 271,362 296,040    
Long-term debt 0 0    
Other long-term liabilities 70,679 86,600    
Total liabilities 3,236,800 2,267,063    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 5,938,258 5,775,730    
Non-controlling interest 0 0    
Total equity 5,938,258 5,775,730    
Total liabilities and equity 9,175,058 8,042,793    
Reportable Legal Entities [Member] | Non-Guarantors [Member]
        
Current assets        
Cash and cash equivalents 27,023 21,262 30,246 33,340
Restricted cash 4,836 4,836    
Accounts receivable, net 472,889 61,319    
Rebates receivable 72,053 92,227    
Other current assets 66,959 16,785    
Intercompany receivable 0 125,888    
Total current assets 643,760 322,317    
Property and equipment, net 41,724 8,262    
Goodwill 83,465 83,465    
Other intangible assets, net 17,928 21,214    
Investment in subsidiaries 37,071 0    
Other long-term assets 22,184 59,932    
Total assets 846,132 495,190    
Current liabilities        
Accounts payable 44,886 37,251    
Accrued expenses and other current liabilities 28,583 28,403    
Rebates payable 61,494 40,065    
Current portion - long-term debt 0 0    
Intercompany payable 332,249 0    
Total current liabilities 467,212 105,719    
Deferred income taxes 5,302 5,301    
Long-term debt 0 0    
Other long-term liabilities 24,707 23,651    
Total liabilities 497,221 134,671    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity 347,666 359,274    
Non-controlling interest 1,245 1,245    
Total equity 348,911 360,519    
Total liabilities and equity 846,132 495,190    
Consolidations [Member]
        
Current assets        
Cash and cash equivalents 0 0 0 0
Restricted cash 0 0    
Accounts receivable, net (108,457) (55,933)    
Rebates receivable (678,788) (295,973)    
Other current assets 0 20,973    
Intercompany receivable (402,637) (256,631)    
Total current assets (1,189,882) (587,564)    
Property and equipment, net 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Investment in subsidiaries (6,239,766) (6,086,812)    
Other long-term assets (4,813) (46,363)    
Total assets (7,434,461) (6,720,739)    
Current liabilities        
Accounts payable (142,172) (59,501)    
Accrued expenses and other current liabilities 0 22,679    
Rebates payable (678,788) (295,973)    
Current portion - long-term debt 0 0    
Intercompany payable (332,249) (232,124)    
Total current liabilities (1,153,209) (564,919)    
Deferred income taxes 0 0    
Long-term debt 0 0    
Other long-term liabilities 0 (22,579)    
Total liabilities (1,153,209) (587,498)    
Commitments and contingencies (Note 10)          
Shareholders’ equity        
Total shareholders' equity (6,285,924) (6,135,004)    
Non-controlling interest 4,672 1,763    
Total equity (6,281,252) (6,133,241)    
Total liabilities and equity $ (7,434,461) $ (6,720,739)