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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Deferred lease incentives$ 2.7$ 3.2
Deferred rent associated with lease obligations9.67.9
Gain on sale and lease back of Loudoun, Virginia campus building, before tax2.8 
Sale and lease back term, years10 
Non-current portion of sale lease back gain$ 1.3$ 1.5
Maximum [Member]
  
Leasehold improvements, long-term liability amortization period10 
Minimum [Member]
  
Leasehold improvements, long-term liability amortization period5