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Subsequent Events - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 1 Months Ended
Nov. 30, 2012
Aug. 31, 2012
Nov. 30, 2011
Jun. 17, 2011
Jan. 07, 2013
Subsequent Events [Member]
Dec. 11, 2012
Subsequent Events [Member]
Subsequent Events [Line Items]            
Percentage of increase in regular quarterly cash dividend           7.00%
Cash dividend declared $ 0.29 $ 0.29 $ 0.27     $ 0.31
Revolving credit facility, extended maturity period         5 years  
Credit facility, maximum current revolving commitment       $ 75.0 $ 125.0  
Revolving credit facility, maturity date         Jan. 07, 2018  
Line of credit facilty, interest rate description         In addition, per the terms of the Amendment, the LIBOR margin will decrease to 0.85 percent  
LIBOR margin rate       0.90% 0.85%  
Letter of credit fee, percentage         0.85%  
Commitment fee annual rate 0.90%       0.12%  
Line of credit facilty, commitment fee description         As a result of the increase in the revolving commitment amount, the Company will incur commitment fees applied to the portion of the total credit facility commitment that has not been borrowed until outstanding loans and letters of credit exceed $62.5 million  
Loans and letters of credit, outstanding amount         $ 62.5