Capital Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Schedule of Capitalization, Equity [Line Items]
Dividends per share	$ 0.22	$ 0.20	$ 0.22	$ 0.20
Class A Common Stock $.01 Par Value | Stock Repurchase Plan
Schedule of Capitalization, Equity [Line Items]
Stock Purchase Plan, authorized purchase amount			$ 330.0
Stock Purchase Plan, purchased shares to date	7,063,962		7,063,962
Stock Purchase Plan, purchased amount to date	268.3		268.3
Stock Purchase Plan, remaining repurchase authority			$ 61.7