Restructuring Expense (Details) (USD $)	3 Months Ended								12 Months Ended							1 Months Ended		12 Months Ended		12 Months Ended				108 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2003	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	Dec. 31, 2006 Kendall Square Facility squarefeet	Dec. 31, 2003 Kendall Square Facility	Dec. 31, 2013 Fan Pier Move	Dec. 31, 2013 2003 Restructuring	Dec. 31, 2012 2003 Restructuring	Dec. 31, 2011 2003 Restructuring	Dec. 31, 2012 2003 Restructuring	Dec. 31, 2010 2003 Restructuring	Dec. 31, 2003 2003 Restructuring
Kendall Square Lease
Leased area (in square feet)																290,000
Lease term (in years)																	15 years
Occupied leased area (in square feet)																		120,000
Discount rate, lease restructuring liability (as a percent)																			10.00%
Restructuring Expense	$ 27,658,000	$ 12,048,000	$ 776,000	$ 39,000	$ 194,000	$ 696,000	$ 594,000	$ 360,000	$ 40,521,000	$ 1,844,000	$ 2,074,000	$ 91,824,000	$ 84,726,000	$ 2,616,000	$ 4,482,000					$ 1,200,000	$ 372,000	$ 1,844,000	$ 2,074,000	$ 62,851,000
Cash Payments												(17,816,000)	(15,200,000)	(2,616,000)	0						(15,255,000)	(14,853,000)	(14,904,000)	(178,952,000)
Non-cash Expense												(4,482,000)	0	0	(4,482,000)
Restructuring Liability												69,526,000	69,526,000	0	0						19,115,000	23,328,000	26,313,000	23,328,000	29,595,000	69,526,000
Lease restructuring expense												78,700,000
Lease operating expense												$ 6,000,000