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Fair Value of Financial Instruments - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value $ 1,812,510us-gaap_AvailableForSaleSecurities $ 1,795,606us-gaap_AvailableForSaleSecurities
Fixed-maturity securities classified as trading, carried at fair value 7,711us-gaap_TradingSecurities 12,991us-gaap_TradingSecurities
Fair value assumptions, percentage of securities assessed by third-party pricing service 95.00%pri_FairValueAssumptionsPercentageOfSecuritiesAssessedByThirdPartyPricingService  
Fair Value, Recurring Measurements [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Fixed-maturity securities classified as trading, carried at fair value 7,711us-gaap_TradingSecurities
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Assets, fair value disclosure, recurring 4,260,524us-gaap_AssetsFairValueDisclosureRecurring
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Liabilities, fair value disclosure, recurring 2,440,303us-gaap_LiabilitiesFairValueDisclosureRecurring
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Fair Value, Recurring Measurements [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Assets, fair value disclosure, recurring 49,273us-gaap_AssetsFairValueDisclosureRecurring
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Fair Value, Recurring Measurements [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Fixed-maturity securities classified as trading, carried at fair value 7,711us-gaap_TradingSecurities
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Liabilities, fair value disclosure, recurring 2,440,303us-gaap_LiabilitiesFairValueDisclosureRecurring
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Fair Value, Recurring Measurements [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Assets, fair value disclosure, recurring 1,165us-gaap_AssetsFairValueDisclosureRecurring
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Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 15,647us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | U.S. Government and Agencies [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 15,647us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Foreign Government [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 122,497us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Foreign Government [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 122,497us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 40,694us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | States and Political Subdivisions [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 40,694us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Corporates [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 1,315,868us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 1 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 2,104us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 1,313,534us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Corporates [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 230us-gaap_AvailableForSaleSecurities
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 264,414us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Asset-backed Securities [Member] | Level 2 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 263,527us-gaap_AvailableForSaleSecurities
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Fair Value, Recurring Measurements [Member] | Asset-backed Securities [Member] | Level 3 [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 887us-gaap_AvailableForSaleSecurities
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Available-for-sale securities, fair value 1,755,899us-gaap_AvailableForSaleSecurities
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
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