Basis of Presentation (Details)	12 Months Ended
Dec. 31, 2016
Basis of Presentation
Percentage of private passenger automobile insurance to total direct written premiums	57.70%

Represents the percentage of private passenger automobile insurance to total direct written premiums.

No definition available.

Name:	saft_PercentageOfPrivatePassengerAutoInsuranceToTotalDirectWrittenPremiums
Namespace Prefix:	saft_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration