Convertible Senior Subordinated Notes (Details) (USD $)					1 Months Ended	3 Months Ended
	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2010 Convertible Senior Subordinated Notes 3.35 Percent Due 2015	Jun. 30, 2013 Convertible Senior Subordinated Notes 3.35 Percent Due 2015
Convertible Senior Subordinated Notes
Convertible senior subordinated notes	$ 0	[1]	$ 400,000,000	[1]	$ 400,000,000
Net proceeds from convertible debt offering					391,600,000
Underwriting discount					8,400,000
Conversion price (in dollars per share)					$ 48.83
Convertible senior subordinated notes (due 2015) conversion						(8,188,448)
Stock Redeemed or Called During Period, Value						200,000
Redemption Premium						16.75
Original conversion rate, number of shares to be issued per $1000 of principal (in shares)					20.4794
Convertible debt principal amount, basis for exchange					1,000	1,000
Interest rate (as a percent)					3.35%
Percent closing price needs to exceed the conversion price for at least 20 trading days within 30 consecutive trading days for provisional redemption (as a percent)					130.00%
Minimum number of days within 30 consecutive trading days the closing price needs to exceed the conversion price for provisional redemption (in days)					20 days
Total consecutive trading days during which the closing price must exceed the conversion price for at least 20 trading days for provisional redemption (in days)					30 days
Debt Conversion, Converted Instrument, Amount						399,800,000
Debt Conversion, Converted Instrument, Shares Issued						87,109
Interest Expense, Debt						6,700,000
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature						$ 4,200,000

[1] Amounts include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note C, "Collaborative Arrangements," to these condensed consolidated financial statements for amounts.