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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Jun. 17, 2011
Nov. 30, 2012
Schedule Of Debt [Line Items]    
Revolving credit facility, amount $ 75.0  
Revolving credit facility, maturity period 3 years  
Revolving credit facility, expiration date Jun. 17, 2014  
LIBOR margin rate 0.90%  
Commitment fee annual rate   0.90%
Commitment fee, annual rate applied to amount not borrowed   0.15%
Outstanding loans and letters of credit maximum amount   37.5
Revolving credit facility, borrowed   0
Revolving credit facility, amount repaid   0
Revolving credit facility, amount outstanding   45.0
Minimum [Member]
    
Schedule Of Debt [Line Items]    
Consolidated earnings before interest, income taxes, depreciation and amortization   $ 40.0