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Capital Stock (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |
Common stock, authorized (in shares) | 500,000,000 us-gaap_CommonStockSharesAuthorized | 500,000,000 us-gaap_CommonStockSharesAuthorized |
Common stock, par value (in dollars per share) | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |
Weighted average share outstanding [Abstract] |  |  |
Basic weighted-average common shares outstanding (in shares) | 59,073,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 58,606,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 60,600,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: Stock awards and options (in shares) | 1,814,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 2,842,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 2,425,000 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted-average common shares outstanding (in shares) | 60,887,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 61,448,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 63,025,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Securities excluded from the calculation of diluted earnings per share | 2,700,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,200,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 100,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common stock repurchased | $ 45,724,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 140,865,000 us-gaap_TreasuryStockValueAcquiredCostMethod | $ 201,471,000 us-gaap_TreasuryStockValueAcquiredCostMethod
Increment authorized by the Company's board of directors under the stock repurchase program | 400,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | 250,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Amount available for repurchases | 348,800,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, authorized (in shares) | 25,000,000 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |
Preferred stock, par value (in dollars per share) | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |
Shares outstanding (in shares) | 0 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | 0 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |
Common Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, authorized (in shares) | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Common stock, par value (in dollars per share) | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Number of votes class is entitled to | 1 nus_CommonStockVotingRightsPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Number of shares of class A common stock issued after conversion of Class B common stock |  | 1 nus_NumberOfSharesOfClassCommonStockIssuedAfterConversionOfClassBCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Weighted average share outstanding [Abstract] |  |  |
Shares repurchased (in shares) | 800,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 1,700,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 4,600,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock repurchased | $ 45,724,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 140,865,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 201,471,000 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, authorized (in shares) | 100,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Common stock, par value (in dollars per share) | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Shares outstanding (in shares) | 0 us-gaap_SharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Number of votes class is entitled to | 10 nus_CommonStockVotingRightsPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |

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