XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments - Loss from Closed Currency Forward Contracts Recorded in Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract] |  |
Deferred loss related to closed forward contracts | $ (26.4) | $ (26.4)

X
- Definition Accumulated other comprehensive income loss deferred gain loss from closed contracts in net investment hedge net of tax. + References No definition available. + Details
Name: | pri_AccumulatedOtherComprehensiveIncomeLossDeferredGainLossFromClosedContractsInNetInvestmentHedgeNetOfTax
Namespace Prefix: | pri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Derivative instruments, gain (loss) recognized in other comprehensive income (loss), effective portion, net. + References No definition available. + Details
Name: | pri_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeLossEffectivePortionNetAbstract
Namespace Prefix: | pri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration