Deconsolidation of Subsidiaries - Company's Investment in Deconsolidated Entities (Details) - USD ($) $ in Thousands		3 Months Ended
		Feb. 29, 2020	Feb. 28, 2019
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018	[1]	$ 137,849
Change in fair value		0	$ (33,965)
Investment in Lamington at February 28, 2019		143,201
Lamington
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018		128,800	128,795
Increase in basis investment			711
Change in fair value			(33,965)
Investment in Lamington at February 28, 2019		$ 95,500	95,541
Lamington | Promissory notes
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018			56,596
Increase in basis investment			0
Change in fair value			0
Investment in Lamington at February 28, 2019			56,596
Lamington | Other liabilities
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018			5,948
Increase in basis investment			711
Change in fair value			0
Investment in Lamington at February 28, 2019			6,659
Lamington | Equity investment
Investment in Deconsolidated Subsidiary [Roll Forward]
Investment in Lamington at December 1, 2018			66,251
Increase in basis investment			0
Change in fair value			(33,965)
Investment in Lamington at February 28, 2019			$ 32,286

[1] Derived from audited consolidated financial statements.