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Marketable Securities (Details) (USD $)
 12 Months Ended
Jan. 25, 2015
Jan. 26, 2014
Jan. 27, 2013
Classified as:      
Cash equivalents $ 294,710,000us-gaap_CashEquivalentsAtCarryingValue $ 572,425,000us-gaap_CashEquivalentsAtCarryingValue  
Marketable securities 4,126,685,000us-gaap_MarketableSecuritiesCurrent 3,520,223,000us-gaap_MarketableSecuritiesCurrent  
Estimated Fair Value 4,421,395,000us-gaap_AvailableForSaleSecurities 4,092,648,000us-gaap_AvailableForSaleSecurities  
Amortized Cost Basis      
Less than one year 1,570,233,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost 1,883,132,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due in 1-5 years 2,719,852,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost 2,114,289,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date 122,893,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost 90,472,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Total 4,412,978,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 4,087,893,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Estimated Fair Value      
Less than one year 1,570,622,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue 1,883,753,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due in 1-5 years 2,725,945,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue 2,117,387,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date 124,828,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue 91,508,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Total 4,421,395,000us-gaap_AvailableForSaleSecuritiesDebtSecurities 4,092,648,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,364,217,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 35,875,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,400,092,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (2,396,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (232,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 9us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1    
Available-for-sale Securities, Amortized Cost Basis 4,412,977,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 4,087,893,000us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Net realized gain 100,000us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments 2,400,000us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments 500,000us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Available For Sale Securities Net Unrealized Gain Loss 8,400,000nvda_AvailableForSaleSecuritiesNetUnrealizedGainLoss 4,800,000nvda_AvailableForSaleSecuritiesNetUnrealizedGainLoss  
Gross Unrealized Gain 11,046,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 7,178,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains  
Gross Unrealized Losses (2,628,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss (2,423,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss  
Corporate Debt Securities      
Classified as:      
Estimated Fair Value 2,186,311,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,763,725,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 709,392,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 10,085,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 719,477,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (1,199,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (15,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		    
Available-for-sale Securities, Amortized Cost Basis 2,184,925,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,762,833,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Gross Unrealized Gain 2,600,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		 1,837,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
Gross Unrealized Losses (1,214,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		 (945,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CorporateDebtSecuritiesMember		  
US Government Agencies Debt Securities      
Classified as:      
Estimated Fair Value 750,320,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,013,327,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 246,480,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 246,480,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (227,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		    
Available-for-sale Securities, Amortized Cost Basis 749,630,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,012,740,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Gross Unrealized Gain 917,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 848,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Gross Unrealized Losses (227,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 (261,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
US Treasury Securities      
Classified as:      
Estimated Fair Value 536,364,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		 496,453,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 10,026,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 10,026,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (3,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		    
Available-for-sale Securities, Amortized Cost Basis 533,673,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		 495,889,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		  
Gross Unrealized Gain 2,694,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		 621,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		  
Gross Unrealized Losses (3,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		 (57,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember		  
Money Market Funds      
Classified as:      
Estimated Fair Value 132,495,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 307,865,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Amortized Cost Basis 132,495,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 307,865,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		  
Gross Unrealized Gain 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		  
Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember		  
Asset-backed Securities      
Classified as:      
Estimated Fair Value 452,884,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 257,717,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 306,066,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 4,476,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 310,542,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (323,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (6,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		    
Available-for-sale Securities, Amortized Cost Basis 453,088,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 258,017,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		  
Gross Unrealized Gain 125,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 15,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		  
Gross Unrealized Losses (329,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		 (315,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_AssetBackedSecuritiesMember		  
Mortgage backed securities issued by United Sates government-sponsored enterprises      
Classified as:      
Estimated Fair Value 278,105,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 188,706,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 81,245,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 21,314,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 102,559,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (639,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (211,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Available-for-sale Securities, Amortized Cost Basis 274,366,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 185,594,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Gross Unrealized Gain 4,589,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 3,837,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Gross Unrealized Losses (850,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 (725,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Foreign Government Debt      
Classified as:      
Estimated Fair Value 84,916,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		 64,855,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 11,008,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 11,008,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses (5,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		    
Available-for-sale Securities, Amortized Cost Basis 84,800,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		 64,955,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		  
Gross Unrealized Gain 121,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		 20,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		  
Gross Unrealized Losses $ (5,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember		 $ (120,000)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_ForeignGovernmentDebtMember