Rialto Segment (Schedule of Credit Facilities) (Details)	9 Months Ended
	Aug. 31, 2016 USD ($) extension	Oct. 04, 2016 USD ($)	Nov. 30, 2015 USD ($)
Warehouse Repurchase Facility | Rialto
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment	$ 850,000,000
364-day warehouse repurchase facility that matures October 2016 | Rialto
Line of Credit Facility [Line Items]
Term of note	364 days
364-day warehouse repurchase facility that matures October 2016 | Warehouse Repurchase Facility | Rialto
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment	$ 400,000,000
Extension term	1 year
364-day warehouse repurchase facility that matures January 2017 | Rialto
Line of Credit Facility [Line Items]
Term of note	364 days
364-day warehouse repurchase facility that matures January 2017 | Warehouse Repurchase Facility | Rialto
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment	$ 250,000,000
Warehouse repurchase facility that matures December 2017 | Warehouse Repurchase Facility | Rialto
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment	100,000,000
Warehouse repurchase facility that matures August 2018 | Warehouse Repurchase Facility | Rialto
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment	100,000,000
Borrowings under the facilities	$ 36,300,000		$ 36,300,000
Number of extensions | extension	2
Extension term	1 year
Subsequent Event [Member] | Warehouse repurchase facility that matures April 2017 [Member]
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment		$ 500,000,000
Subsequent Event [Member] | Warehouse repurchase facility that matures December 2017
Line of Credit Facility [Line Items]
Maximum Aggregate Commitment		$ 200,000,000