Investment in Limited Partnership - Reconciliation of Receivable For Maturity of Life Settlements (Details) $ in Thousands	3 Months Ended
Feb. 29, 2020 USD ($)
Investments in and Advances to Affiliates [Abstract]
Maturities	$ 46,900
Proceeds received	33,126
Receivable at February 29, 2020	$ 13,774

Investments in and Advances to Affiliates, Receivable From Maturity of Life Settlements

No definition available.

Name:	emg_InvestmentsinandAdvancestoAffiliatesReceivableFromMaturityofLifeSettlements
Namespace Prefix:	emg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant