Debt and Credit Facilities (Details) (USD $)	12 Months Ended		1 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Jun. 30, 2003 Mortgage Note	May 31, 2013 Mortgage Note	Nov. 30, 2013 Cash Borrowings	Nov. 30, 2013 Letters Of Credit	Nov. 30, 2013 Swing Line Loans	Nov. 30, 2013 Revolving Line Of Credit	Nov. 30, 2013 Letters Of Credit Two	Nov. 30, 2013 Guarantee Credit Line	Nov. 30, 2012 Guarantee Credit Line	Nov. 30, 2013 Additional Borrowings For Letters Of Credit Or Cash	Nov. 30, 2013 Maximum	Nov. 30, 2013 Minimum	Nov. 30, 2013 2014 Leverage Ratio Maximum
Line of Credit Facility [Line Items]
Mortgage note payable, face amount			$ 54,000,000.0
Balance outstanding				34,700,000
Revolving credit facility, maximum capacity					250,000,000	50,000,000	10,000,000	10,000,000
Line Of Credit Facility Maximum Borrowing Capacity Increase												100,000,000
Line Of Credit Facility Potential Maximum Borrowing Capacity												350,000,000
Basis spread on variable rate													1.25%	0.25%
Spread over LIBOR													2.25%	1.25%
Base rate spread over federal fund rate	0.50%
LIBOR interest period (in months)	1 month
Base rate spread over LIBOR	1.00%
Loan origination fee and issuance costs		3,400,000
Interest expense amortization period (in years)	5 years
Default applicable interest rate on all obligations	2.00%
Interest coverage ratio														3.5
Leverage ratio													3.0		2.75
Revolving credit facility amount outstanding									1,600,000
Guarantee facility, maximum capacity										16,300,000
Bank guarantees										13,700,000	12,500,000
Restricted cash	$ 15,700,000	$ 14,600,000