Long-Term Receivables, Net (Details 2) (USD $) In Thousands, unless otherwise specified				1 Months Ended	9 Months Ended				9 Months Ended
	Sep. 30, 2012 Deficiency payments receivable	Dec. 31, 2011 Deficiency payments receivable	Dec. 31, 2010 Deficiency payments receivable	Apr. 30, 2000 Bradley International Airport parking facilities operating agreement	Sep. 30, 2012 Bradley International Airport parking facilities operating agreement parkingspace tier	Sep. 30, 2012 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds	Sep. 30, 2011 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds	Apr. 06, 2000 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds	Sep. 30, 2012 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds Low end of the range	Sep. 30, 2012 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds High end of the range	Sep. 30, 2012 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds Deficiency payments receivable	Dec. 31, 2011 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds Deficiency payments receivable	Apr. 06, 2000 Bradley International Airport parking facilities operating agreement Non-taxable series A bonds	Apr. 06, 2000 Bradley International Airport parking facilities operating agreement Taxable series B bonds
Agreement
Agreement period with the State of Connecticut for operation of parking spaces				25 years
Number of garage parking spaces at Bradley International Airport operated					3,500
Revenue bonds issued								$ 53,800					$ 47,700	$ 6,100
Annual principal and interest on revenue bonds									3,600	4,500
Annual minimum guaranteed payment to the State by the trustee						7,754	7,595		8,300	13,200
Deficiency Payments
Maximum premium percentage on initial deficiency payment						10.00%
Period after notification to deliver deficiency amount to trustee						3 days
Deficiency payments (net of repayments received)						1,221	1,053
Premium income on deficiency payment received from trustee							54
Interest income on deficiency payment received from trustee						85	256
Receivable compromised of cumulative deficiency payments, net of reimbursements	14,628	13,407	12,070								14,628	13,407
Compensation
Number of operating profit tiers					3
Management fee apportioned to the entity (as a percent)					60.00%
Management fee apportioned to an un-affiliated entity (as a percent)					40.00%
Unrecognized cumulative management fees					$ 5,850