Fair Value Disclosures - Investments Measured at Fair Value Based on Net Asset Value Per Share (Footnote) (Detail)	9 Months Ended
	Aug. 31, 2016	Nov. 30, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investment at fair value in liquidation	2.00%
Fixed Income and High Yield Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investments with no redemption provisions		8.00%
Fund of Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of investments with no redemption provisions	98.00%	95.00%
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	99.00%	100.00%
Estimated period for the liquidation of the underlying assets, Minimum	1 year
Estimated period for the liquidation of the underlying assets, Maximum	8 years
Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of redeemable investments	12.00%	100.00%
Minimum [Member] | Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period redemption of investment prior written notice period	30 days
Maximum [Member] | Multi-asset Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period redemption of investment prior written notice period	90 days