Long-Term Receivables, Net (Details 2) (USD $) In Thousands, unless otherwise specified				1 Months Ended	3 Months Ended
	Mar. 31, 2013 Receivable compromised of cumulative deficiency payments, net of reimbursements	Dec. 31, 2012 Receivable compromised of cumulative deficiency payments, net of reimbursements	Dec. 31, 2011 Receivable compromised of cumulative deficiency payments, net of reimbursements	Apr. 30, 2000 Bradley International Airport parking facilities operating agreement	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement item	Mar. 31, 2012 Bradley International Airport parking facilities operating agreement	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement Low end of the range	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement High end of the range	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement Receivable compromised of cumulative deficiency payments, net of reimbursements	Dec. 31, 2012 Bradley International Airport parking facilities operating agreement Receivable compromised of cumulative deficiency payments, net of reimbursements	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement Receivable for interest and premium income related to deficiency repayments	Mar. 31, 2012 Bradley International Airport parking facilities operating agreement Receivable for interest and premium income related to deficiency repayments	Apr. 06, 2000 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds Low end of the range	Mar. 31, 2013 Bradley International Airport parking facilities operating agreement State of Connecticut special facility revenue bonds High end of the range	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					2,621	2,567	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)					403	779
Premium income on deficiency payment received from trustee					0	0
Interest income on deficiency payment received from trustee					0	0
Receivable from trustee	15,001	14,598	13,407						15,001	14,598	0	0
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					6,150
Management fees					$ 0	$ 0