Restructuring Liabilities (Details)	12 Months Ended		9 Months Ended
	Dec. 31, 2011 sqft	Dec. 31, 2003 Kendall Restructuring	Sep. 30, 2014 Fan Pier Move Restructuring sqft
Restructuring Cost and Reserve [Line Items]
Lease term (in years)		15 years
Restructuring and related activities, leased office space, maximum percentage used - not more than		50.00%
Area of leased property (in square feet)	1,100,000		120,000
Discount rate related to leases (percent)			9.00%