Related Party Transactions - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	Aug. 28, 2015	Jul. 31, 2016	Mar. 31, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Related Party Transaction [Line Items]
Purchase commitments from Berkadia Commercial Mortgage, LLC				$ 817,000,000	$ 752,400,000
Commissions for conducting brokerage services				611,574,000	659,002,000	$ 668,801,000
Loans to and investments in related parties				38,400,000	28,300,000
Proceeds from sale of private equity interests						4,000,000
Noncontrolling interests				651,000	27,468,000
Leucadia [Member]
Related Party Transaction [Line Items]
Noncontrolling interests					26,300,000
Fair value of equity position	$ 124,400,000
Other Assets [Member] | Leucadia [Member]
Related Party Transaction [Line Items]
Tax receivable				80,100,000	109,500,000
Private Equity Related Funds [Member]
Related Party Transaction [Line Items]
Equity investments loans in related funds				37,700,000	39,600,000
Harbinger Group Inc [Member]
Related Party Transaction [Line Items]
Unsettled purchases and sales of loans					261,600,000
Harbinger Group Inc [Member] | Investment Banking [Member]
Related Party Transaction [Line Items]
Service charges					1,300,000	500,000
Leucadia [Member]
Related Party Transaction [Line Items]
Service charges				27,600,000	34,600,000	$ 22,300,000
Due to related party				1,900,000	600,000
Due from related party				$ 2,800,000	$ 10,200,000
Leucadia Funding LLC [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Capital contribution received from related party		$ 30,000,000
Leucadia [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Gain (loss) on related party transaction	$ 0
Hedge Fund Managed by Subsidiary of Leucadia [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Capital contribution made to related party			$ 114,000,000