Capital Stock - Additional Information (Detail) (USD $)	3 Months Ended
	Feb. 29, 2012
Schedule of Capitalization, Equity [Line Items]
Stock Purchase Plan, purchased amount during period	$ 10,299,000
Class A Common Stock $.01 Par Value | Stock Repurchase Plan
Schedule of Capitalization, Equity [Line Items]
Stock Purchase Plan, authorized purchase amount	330,000,000
Stock Purchase Plan, purchased shares to date	7,063,962
Stock Purchase Plan, purchased amount to date	268,300,000
Stock Purchase Plan, purchased shares during period	405,538
Stock Purchase Plan, average cost per share (including commissions) during period	$ 25.40
Stock Purchase Plan, purchased amount during period	10,300,000
Stock Purchase Plan, remaining repurchase authority	$ 61,700,000