Restructuring Expense (Details) (USD $)	3 Months Ended								12 Months Ended				108 Months Ended		12 Months Ended			1 Months Ended		12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2003	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2003 Lease restructuring and other operating lease expense	Dec. 31, 2003 Employee severance, benefits and related costs	Dec. 31, 2003 Leasehold improvements and asset impairments	Jun. 30, 2003 Kendall Square Facility squarefeet	Jan. 31, 2003 Kendall Square Facility Y	Dec. 31, 2006 Kendall Square Facility squarefeet	Dec. 31, 2003 Kendall Square Facility
Kendall Square Lease
Leased area (in square feet)																		290,000
Lease term (in years)																			15
Occupied leased area (in square feet)																				120,000
Discount rate, lease restructuring liability (as a percent)																					10.00%
Lease restructuring liability	$ 23,328,000				$ 26,313,000				$ 23,328,000	$ 26,313,000	$ 29,595,000	$ 69,526,000	$ 23,328,000	$ 34,017,000	$ 69,526,000	$ 0	$ 0
Restructuring expense	194,000	696,000	594,000	360,000	992,000	(419,000)	741,000	760,000	1,844,000	2,074,000	1,501,000	91,824,000	62,479,000		84,726,000	2,616,000	4,482,000
Cash payments									(14,853,000)	(14,904,000)	(14,759,000)	(17,816,000)	(163,697,000)		(15,200,000)	(2,616,000)	0
Non-cash write-off in 2003												(4,482,000)			0	0	(4,482,000)
Liability, end of the period	23,328,000				26,313,000				23,328,000	26,313,000	29,595,000	69,526,000	23,328,000	34,017,000	69,526,000	0	0
Lease restructuring expense												78,700,000
Lease operating expense												$ 6,000,000