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Employee Benefit Plans (Schedule of Ranges of Outstanding And Exercisable Stock Optoins) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 3,939us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 11 months 12 days
Outstanding Options, Weighted Average Exercise Price $ 30.58us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Exercise Price Range, Number of Exercisable Options 2,892us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Exercisable Options, Weighted Average Exercise Price $ 29.65us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
$10.69 - $27.70  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 788us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ZeroPointZeroZeroToTenPointZeroZeroMember
Outstanding Options, Weighted Average Remaining Contractual Term 3 years 10 months 21 days
Outstanding Options, Weighted Average Exercise Price $ 19.19us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ZeroPointZeroZeroToTenPointZeroZeroMember
Exercise Price Range, Number of Exercisable Options 775us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ZeroPointZeroZeroToTenPointZeroZeroMember
Exercisable Options, Weighted Average Exercise Price $ 19.04us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ZeroPointZeroZeroToTenPointZeroZeroMember
$28.79 - $32.30  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 803us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TenPointZeroOneToTwentyPointZeroZeroMember
Outstanding Options, Weighted Average Remaining Contractual Term 4 years 11 months 19 days
Outstanding Options, Weighted Average Exercise Price $ 30.40us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TenPointZeroOneToTwentyPointZeroZeroMember
Exercise Price Range, Number of Exercisable Options 634us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TenPointZeroOneToTwentyPointZeroZeroMember
Exercisable Options, Weighted Average Exercise Price $ 30.11us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TenPointZeroOneToTwentyPointZeroZeroMember
$32.52 - $33.65  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 819us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TwentyPointZeroOneToThirtyPointZeroZeroMember
Outstanding Options, Weighted Average Remaining Contractual Term 8 years 18 days
Outstanding Options, Weighted Average Exercise Price $ 32.67us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TwentyPointZeroOneToThirtyPointZeroZeroMember
Exercise Price Range, Number of Exercisable Options 259us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TwentyPointZeroOneToThirtyPointZeroZeroMember
Exercisable Options, Weighted Average Exercise Price $ 32.71us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_TwentyPointZeroOneToThirtyPointZeroZeroMember
$33.75 - $33.92  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 793us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ThirtyPointZeroOneToFourtyPointZeroZeroMember
Outstanding Options, Weighted Average Remaining Contractual Term 6 years 9 months 18 days
Outstanding Options, Weighted Average Exercise Price $ 33.86us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ThirtyPointZeroOneToFourtyPointZeroZeroMember
Exercise Price Range, Number of Exercisable Options 597us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ThirtyPointZeroOneToFourtyPointZeroZeroMember
Exercisable Options, Weighted Average Exercise Price $ 33.87us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_ThirtyPointZeroOneToFourtyPointZeroZeroMember
$33.99 - $40.01  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options 736us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_FortyPointZeroOneToFiftyPointZeroZeroMember
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 11 months 12 days
Outstanding Options, Weighted Average Exercise Price $ 37.12us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_FortyPointZeroOneToFiftyPointZeroZeroMember
Exercise Price Range, Number of Exercisable Options 627us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_FortyPointZeroOneToFiftyPointZeroZeroMember
Exercisable Options, Weighted Average Exercise Price $ 37.03us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= ntgr_FortyPointZeroOneToFiftyPointZeroZeroMember