The Company and Summary of Significant Accounting Policies - Concentrations of Risk Additional Information (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2017 USD ($) Customer	Dec. 31, 2016 Customer
Concentration Risk [Line Items]
Number of customers with significant accounts receivable \| Customer	5	5
Customer concentration risk \| Gross accounts receivable
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	91.00%	90.00%
Customer concentration risk \| Gross accounts receivable \| Express Scripts
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	72.00%	73.00%
Customer concentration risk \| Gross accounts receivable \| McKesson
Concentration Risk [Line Items]
Percentage of gross accounts receivable (as a percent)	17.00%	13.00%
Foreign exchange forward contracts \| Derivatives not designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	$ 330,600,000
Net fair value	11,800,000
Interest rate contracts \| Derivatives designated as hedging instruments
Concentration Risk [Line Items]
Notional amount	300,000,000
Net fair value	$ (1,100,000)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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