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Schedule II - Primerica, Inc. (Parent Only) - Condensed Statements of Cash Flow Parenthetical (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]
Fixed-maturity securities transferred	$ 27.6	$ 35.5	$ 39.2

X

- Definition

Equity method investments fixed maturity securities transferred.

+ References

No definition available.

+ Details

Name:	pri_EquityMethodInvestmentsFixedMaturitySecuritiesTransferred
Namespace Prefix:	pri_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration