Compensation Plans - Activity of Restricted Stock Units (Detail) (Restricted Stock Unit [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Feb. 28, 2013
Future Service Required [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance, beginning of period	9,216
Restricted stock units, Grants
Restricted stock units, Distribution of underlying shares
Restricted stock units, Fulfillment of service requirement	(2,837)
Balance, end of period	6,379
Weighted Average Grant Date Fair Value, beginning of period	$ 18.67
Restricted stock units, Grants, Weighted Average Grant Date Fair Value
Restricted stock units, Distribution of underlying shares, Weighted Average Grant Date Fair Value
Restricted stock units, Fulfillment of service requirement, Weighted Average Grant Date Fair Value	$ 25.54
Weighted Average Grant Date Fair Value, end of period	$ 15.60
No Future Service Required [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance, beginning of period	16,656
Restricted stock units, Grants	83	[1]
Restricted stock units, Distribution of underlying shares	(7,711)
Restricted stock units, Fulfillment of service requirement	2,837
Balance, end of period	11,865
Weighted Average Grant Date Fair Value, beginning of period	$ 12.79
Restricted stock units, Grants, Weighted Average Grant Date Fair Value	$ 15.78
Restricted stock units, Distribution of underlying shares, Weighted Average Grant Date Fair Value	$ 18.01
Restricted stock units, Fulfillment of service requirement, Weighted Average Grant Date Fair Value	$ 25.54
Weighted Average Grant Date Fair Value, end of period	$ 12.46

[1] Includes approximately 83,000 dividend equivalents declared on RSUs during the three months ended February 28, 2013. The weighted average grant date fair value of these dividend equivalents was approximately $15.78.