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Investments - Loss from Closed Currency Forward Contracts Recorded in Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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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)

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

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- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration