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Summary of Property and Equipment by Major Country (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2012
Nov. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 93,526 $ 89,871
United States
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 83,283 83,500
United Kingdom
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net 1,173 1,386
Other
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property and equipment, net $ 9,070 $ 4,985