Business Segment Information - Additional Information (Details)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Business Segment Information
Percentage of merchant banking in total revenue	13.00%	16.00%

It represents percentage of merchant banking in total revenue.

No definition available.

Name:	srl_PercentageOfMerchantBankingInTotalRevenue
Namespace Prefix:	srl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration