Fair Value Disclosures - Investments Measured at Fair Value Based on Net Asset Value Per Share (Parenthetical) (Detail) (USD $)	3 Months Ended
	Feb. 28, 2013		Nov. 30, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded commitments	$ 47,566,000	[1]	59,378,000	[1]
Investments, at fair value	71,103,000		127,023,000
Equity Long/Short Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of redeemable investments	98.00%		96.00%
Notice period redemption of investments prior written notice period	30-65 days
Aggregate fair value of investments in private asset management funds managed	500,000
Funds Of Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investments with no redemption provisions	94.00%		94.00%
Percentage of investments at fair value expected to liquidate	6.00%		6.00%
Estimated period for the liquidation of the underlying assets, Minimum	1 year
Estimated period for the liquidation of the underlying assets, Maximum	2 years
Private Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investments at fair value expected to liquidate	98.00%		98.00%
Estimated period for the liquidation of the underlying assets, Minimum	1 year
Estimated period for the liquidation of the underlying assets, Maximum	8 years
Equity Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investments at fair value expected to liquidate	2.00%		2.00%
Fair value of investments in equity funds	58,100,000		55,600,000
Unfunded commitments	45,800,000		56,900,000
Convertible Bonds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redeemable period of investments	5 days
Investments Which are Not Investment Companies [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investments, at fair value	$ 35,500,000		91,800,000

[1] Investments at fair value in the Consolidated Statements of Financial Condition at February 28, 2013 and November 30, 2012 include $35.5 million and $91.8 million, respectively, of direct investments which do not have the characteristics of investment companies and therefore not included within this table.