Accounting Developments (Details) - USD ($) $ in Thousands	Nov. 30, 2016	Dec. 01, 2015	Nov. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in managed funds	$ (186,508)		$ (85,775)
Accrued expenses and other liabilities	(1,248,200)		(1,049,019)
Noncontrolling interests	$ (651)		$ (27,468)
Accounting Standards Update 2015-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investments in managed funds		$ 27,000
Accrued expenses and other liabilities		700
Noncontrolling interests		$ 26,300