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Business Combinations - Catalyst Merger (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Jul. 02, 2012
Catalyst
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Dec. 31, 2013
Catalyst
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Dec. 31, 2012
Catalyst
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Jul. 02, 2012
Catalyst
Common Shares
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Sep. 30, 2012
Catalyst
Initial Amounts Recognized at Acquisition Date
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Dec. 31, 2013
Catalyst
Measurement Period Adjustments
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Dec. 31, 2012
Catalyst
Measurement Period Adjustments
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Dec. 31, 2013
Catalyst
Current Amounts Recognized at Acquisition Date
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Dec. 31, 2012
Catalyst
Employees Settlements
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Dec. 31, 2012
Catalyst
Severence Cost
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| Business Acquisition [Line Items] | |||||||||||||
| Future amortization expense, 2014 | $ 213,200,000 | ||||||||||||
| Merger Agreement [Abstract] | |||||||||||||
| Stock conversion, share received per share converted | 1.3212 | ||||||||||||
| Stock conversion, cash received per share converted, prior to stock split | 0.6606 | ||||||||||||
| Stock conversion, cash received per share converted | $ 28 | ||||||||||||
| Shares issued | 66,800,000 | ||||||||||||
| Warrants, Issued | 500,000 | ||||||||||||
| Goodwill expected to be tax deductible | 525,000,000 | ||||||||||||
| Amortization of intangible assets | 203,192,000 | 130,116,000 | 16,385,000 | 166,100,000 | |||||||||
| Fair value of intangible assets | 1,200,000,000 | ||||||||||||
| Customer relationships, weighted average useful life | 9 years | ||||||||||||
| Business Combination, Consideration Transferred [Abstract] | |||||||||||||
| Cash paid to shareholders | 1,415,276,000 | ||||||||||||
| Fair value of common shares issued | 3,238,141,000 | ||||||||||||
| Fair value of warrants and stock options issued | 19,824,000 | ||||||||||||
| Total purchase price | 4,673,241,000 | ||||||||||||
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] | |||||||||||||
| Cash and cash equivalents | 93,775,000 | 0 | (315,000) | 93,460,000 | |||||||||
| Other current assets | 695,888,000 | 2,411,000 | 5,202,000 | 703,501,000 | |||||||||
| Total current assets | 789,663,000 | 2,411,000 | 4,887,000 | 796,961,000 | |||||||||
| Goodwill | 4,720,275,000 | 4,478,038,000 | 291,045,000 | 4,010,235,000 | 16,141,000 | 8,492,000 | 4,034,868,000 | ||||||
| Intangible assets | 1,184,800,000 | 0 | 0 | 1,184,800,000 | |||||||||
| Other long-term assets | 87,174,000 | 8,000 | 1,547,000 | 88,729,000 | |||||||||
| Total assets acquired | 6,071,872,000 | 18,560,000 | 14,926,000 | 6,105,358,000 | |||||||||
| Accounts payable | 338,819,000 | 5,000 | 0 | 338,824,000 | |||||||||
| Pharmacy benefit management rebates payable | 176,202,000 | (1,522,000) | 2,935,000 | 177,615,000 | |||||||||
| Accrued expenses and other current liabilities | 187,851,000 | 5,473,000 | 1,348,000 | 194,672,000 | |||||||||
| Long-term debt | 311,994,000 | 0 | 0 | 311,994,000 | |||||||||
| Other long-term liabilities | 385,375,000 | 14,604,000 | 10,643,000 | 410,622,000 | |||||||||
| Total liabilities assumed | 1,400,241,000 | 18,560,000 | 14,926,000 | 1,433,727,000 | |||||||||
| Non-controlling interest | (1,610,000) | 0 | 0 | (1,610,000) | |||||||||
| Net assets acquired | 4,673,241,000 | 0 | 0 | 4,673,241,000 | |||||||||
| Separate Tranactions and Preexisting Relationships [Abstract] | |||||||||||||
| Integration and transaction related costs | 27,200,000 | ||||||||||||
| Transactions expenses | 22,800,000 | ||||||||||||
| Acquisition costs included in selling, general and administrative expenses | 17,000,000 | ||||||||||||
| Contract settlements and termination charges recorded | 3,500,000 | ||||||||||||
| Expenses and losses recognized | 3,100,000 | 10,400,000 | |||||||||||
| Accounts receivable with acquired business | $ 4,100,000 | ||||||||||||