Segment Information - Significant Customers (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues, Net | Minimum
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Accounts Receivable | Minimum
Concentration Risk [Line Items]
Threshold for disclosure of concentration risk	10.00%
Credit Concentration Risk | Revenues, Net | Walgreen Co.
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	12.00%
Credit Concentration Risk | Revenues, Net | CVS/Caremark
Concentration Risk [Line Items]
Concentration risk percentage	17.00%
Credit Concentration Risk | Revenues, Net | Accredo/Curascript
Concentration Risk [Line Items]
Concentration risk percentage	15.00%
Credit Concentration Risk | Revenues, Net | Janssen NV
Concentration Risk [Line Items]
Concentration risk percentage			22.00%
Credit Concentration Risk | Revenues, Net | AmerisourceBergen Drug Corporation
Concentration Risk [Line Items]
Concentration risk percentage			21.00%
Credit Concentration Risk | Revenues, Net | McKesson Corporation
Concentration Risk [Line Items]
Concentration risk percentage			21.00%
Credit Concentration Risk | Accounts Receivable | Walgreen Co.
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	11.00%
Credit Concentration Risk | Accounts Receivable | CVS/Caremark
Concentration Risk [Line Items]
Concentration risk percentage	17.00%
Credit Concentration Risk | Accounts Receivable | Accredo/Curascript
Concentration Risk [Line Items]
Concentration risk percentage	16.00%
Credit Concentration Risk | Accounts Receivable | Bupa Home Healthcare Limited
Concentration Risk [Line Items]
Concentration risk percentage		20.00%
Credit Concentration Risk | Accounts Receivable | Janssen Inc.
Concentration Risk [Line Items]
Concentration risk percentage		12.00%