(Loss) Earnings Per Share - Additional Information (Details) - shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
(Loss) Earnings Per Share
Number of stock option not included in diluted earnings per share	426,000	450,000	575,000

Represents the number of stock option with potential future dilutive effect excluded from calculation of earnings per share.

No definition available.

Name:	srl_StockOptionWithPotentialFutureDilutiveEffectExcludedFromCalculationOfEarningsPerShare
Namespace Prefix:	srl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration