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Stock-Based Compensation (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair Value Assumptions and Methodology [Abstract]      
Weighted average grant date fair value of grants (in dollars per share) $ 13.31 $ 9.98 $ 8.61
Risk-free interest rate (in hundredths) 0.80% [1] 1.80% [1] 1.80% [1]
Dividend yield (in hundredths) 2.70% [2] 2.60% [2] 2.60% [2]
Expected volatility (in hundredths) 46.80% [3] 38.40% [3] 37.80% [3]
nus-Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 58 [4] 63 [4] 69 [4]
Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 6,259,500    
Granted (in shares) 230,000    
Exercised (in shares) 800,000 2,100,000 1,500,000
Forfeited/cancelled/expired (in shares) (25,000)    
Outstanding, Ending (in shares) 5,962,200 6,259,500  
Exercisable (in shares) 3,738,600    
Weighted-average Exercise Price [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 21.36    
Granted (in dollars per share) $ 53.35    
Exercised (in dollars per share) $ 15.90    
Forfeited/cancelled/expired (in dollars per share) $ 18.03    
Outstanding, Ending (in dollars per share) $ 22.90 $ 21.36  
Exercisable (in dollars per share) $ 19.44    
NUS _Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3.56    
nus-Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2.84    
Aggregate intrinsic value $ 87,302,000    
Aggregate intrinsic value, exercisable 65,912,000    
Cash proceeds from stock options exercised 4,565,000 29,713,000 21,181,000
Number of shares [Roll forward]      
Nonvested, beginning balance (in shares) 663,700    
Granted (in shares) 328,600    
Vested (in shares) (259,500)    
Forfeited (in shares) (3,900)    
Nonvested, Ending Balance (in shares) 729,000 663,700  
Weighted-average Grant Date Fair Value [Abstract]      
Nonvested, Beginning Balance (in dollars per share) $ 27.84    
Granted (in dollars per share) $ 53.35    
Vested (in dollars per share) $ 26.71    
Forfeited (in dollars per share) $ 38.65    
Nonvested, Ending Balance (in dollars per share) $ 39.68 $ 27.84  
Stock Incentive Plan 1996 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term of stock options granted (in years) 10Y    
Stock Incentive Plan 2006 [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual term of stock options granted (in years) 7Y    
Omnibus Incentive Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized for issuance (in shares) 7,000,000    
Share-based compensation arrangement by share-based payment award, terms of award Vesting for the options is performance based, with the options vesting in two installments if the Company's earnings per share equal or exceed the two established performance levels, measured in terms of diluted earnings per share. Fifty percent of the options vest upon earnings per share meeting or exceeding the first performance level and fifty percent of the options vest upon earnings per share meeting or exceeding the second performance level.    
Performance-Based Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, terms of award Vesting for the options is performance based, with the options vesting in three installments if the Company's earnings per share equal or exceed the three established performance levels, measured in terms of diluted earnings per share. One third of the options will vest upon earnings per share meeting or exceeding the first performance level, one third of the options will vest upon earnings per share meeting or exceeding the second performance level and one third of the options will vest upon earnings per share meeting or exceeding the third performance level.    
Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 2,754,000    
Granted (in shares) 57,500    
Exercised (in shares) (76,500)    
Forfeited/cancelled/expired (in shares) (8,000)    
Outstanding, Ending (in shares) 2,727,000    
Exercisable (in shares) 1,261,300    
Weighted-average Exercise Price [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 27.32    
Granted (in dollars per share) $ 54.08    
Exercised (in dollars per share) $ 20.46    
Forfeited/cancelled/expired (in dollars per share) $ 30.43    
Outstanding, Ending (in dollars per share) $ 28.06    
Exercisable (in dollars per share) $ 24.32    
NUS _Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 4.28    
nus-Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3.54    
Aggregate intrinsic value 25,483,000    
Aggregate intrinsic value, exercisable 16,062,000    
Weighted-average Grant Date Fair Value [Abstract]      
Granted (in dollars per share) $ 54.08    
loc_Stock Options [Member]
      
Options, Outstanding [Roll Forward]      
Exercised (in shares) (502,300)    
Weighted-average Exercise Price [Abstract]      
Granted (in dollars per share) $ 49.12    
Total fair value of options vested and expensed, net of tax 6,500,000    
Cash proceeds from stock options exercised 8,000,000 29,700,000 21,200,000
Tax benefit realized for stock options exercised 6,300,000 17,400,000 10,300,000
Intrinsic value of stock options exercised 10,600,000 61,600,000 25,400,000
Weighted-average Grant Date Fair Value [Abstract]      
Granted (in dollars per share) $ 49.12    
Unrecognized stock-based compensation expense 8,400,000    
nus-Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2.3    
Service-Based Options [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative compensation expense 8,400,000    
Options, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 3,505,500    
Granted (in shares) 172,500    
Exercised (in shares) (425,800)    
Forfeited/cancelled/expired (in shares) (17,000)    
Outstanding, Ending (in shares) 3,235,200    
Exercisable (in shares) 2,477,300    
Weighted-average Exercise Price [Abstract]      
Outstanding, beginning balance (in dollars per share) $ 16.68    
Granted (in dollars per share) $ 47.47    
Exercised (in dollars per share) $ 15.09    
Forfeited/cancelled/expired (in dollars per share) $ 12.23    
Outstanding, Ending (in dollars per share) $ 18.55    
Exercisable (in dollars per share) $ 16.95    
NUS _Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2.95    
nus-Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2.49    
Aggregate intrinsic value 61,819,000    
Aggregate intrinsic value, exercisable 49,850,000    
Weighted-average Grant Date Fair Value [Abstract]      
Granted (in dollars per share) $ 47.47    
Non-Vested Restricted Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cumulative compensation expense 17,000,000    
Weighted-average Grant Date Fair Value [Abstract]      
Unrecognized stock-based compensation expense $ 17,000,000    
nus-Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2.3    
[1] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;"><sup>(1)</sup></td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">The risk-free interest rate is based upon the rate on a zero coupon U.S. Treasury bill, for periods within the contractual life of the option, in effect at the time of the grant.</td></tr></table></div>
[2] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; margin-left: 18pt; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;"><sup>(2)</sup></td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">The dividend yield is based on the average of historical stock prices and actual dividends paid.</td></tr></table></div>
[3] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;"><sup>(3)</sup></td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">Expected volatility is based on the historical volatility of the Company's stock price, over a period similar to the expected life of the option.</td></tr></table></div>
[4] <div><table cellpadding="0" cellspacing="0" class="DSPFListTable" style="width: 100%; font-family: Arial; font-size: 10pt;"><tr><td style="width: 18pt; font-family: Arial; font-size: 10pt; vertical-align: top; align: right;"><sup>(4)</sup></td><td style="width: auto; font-family: Arial; font-size: 10pt; vertical-align: top;">The expected term of the option is based on the historical employee exercise behavior, the vesting terms of the respective option, and a contractual life of either seven or ten years.</td></tr></table></div>