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Unaudited Quarterly Results (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of Income Tax Expense (Benefit) [Line Items]                          
Settlement of tax audits                   $ (30,552,000)us-gaap_IncomeTaxReconciliationTaxSettlements   $ (30,552,000)us-gaap_IncomeTaxReconciliationTaxSettlements $ (6,035,000)us-gaap_IncomeTaxReconciliationTaxSettlements
Unaudited Quarterly Results [Line items]                          
Net sales     583,870,000us-gaap_SalesRevenueNet 493,165,000us-gaap_SalesRevenueNet 481,801,000us-gaap_SalesRevenueNet 430,508,000us-gaap_SalesRevenueNet 565,448,000us-gaap_SalesRevenueNet 457,317,000us-gaap_SalesRevenueNet 451,115,000us-gaap_SalesRevenueNet 430,338,000us-gaap_SalesRevenueNet 1,989,344,000us-gaap_SalesRevenueNet 1,904,218,000us-gaap_SalesRevenueNet 1,843,641,000us-gaap_SalesRevenueNet
Cost of sales     233,119,000us-gaap_CostOfGoodsAndServicesSold 202,222,000us-gaap_CostOfGoodsAndServicesSold 201,853,000us-gaap_CostOfGoodsAndServicesSold 187,719,000us-gaap_CostOfGoodsAndServicesSold 228,991,000us-gaap_CostOfGoodsAndServicesSold 191,568,000us-gaap_CostOfGoodsAndServicesSold 188,329,000us-gaap_CostOfGoodsAndServicesSold 174,568,000us-gaap_CostOfGoodsAndServicesSold 824,913,000us-gaap_CostOfGoodsAndServicesSold 783,456,000us-gaap_CostOfGoodsAndServicesSold 737,614,000us-gaap_CostOfGoodsAndServicesSold
Gross profit     350,751,000us-gaap_GrossProfit 290,943,000us-gaap_GrossProfit 279,948,000us-gaap_GrossProfit 242,789,000us-gaap_GrossProfit 336,457,000us-gaap_GrossProfit 265,749,000us-gaap_GrossProfit 262,786,000us-gaap_GrossProfit 255,770,000us-gaap_GrossProfit 1,164,431,000us-gaap_GrossProfit 1,120,762,000us-gaap_GrossProfit 1,106,027,000us-gaap_GrossProfit
Selling and administrative expenses     131,916,000us-gaap_SellingGeneralAndAdministrativeExpense 122,226,000us-gaap_SellingGeneralAndAdministrativeExpense 131,930,000us-gaap_SellingGeneralAndAdministrativeExpense 126,635,000us-gaap_SellingGeneralAndAdministrativeExpense 130,680,000us-gaap_SellingGeneralAndAdministrativeExpense 120,563,000us-gaap_SellingGeneralAndAdministrativeExpense 123,062,000us-gaap_SellingGeneralAndAdministrativeExpense 118,660,000us-gaap_SellingGeneralAndAdministrativeExpense 512,707,000us-gaap_SellingGeneralAndAdministrativeExpense 492,965,000us-gaap_SellingGeneralAndAdministrativeExpense 477,270,000us-gaap_SellingGeneralAndAdministrativeExpense
Research and development expenses     28,724,000us-gaap_ResearchAndDevelopmentExpense 27,279,000us-gaap_ResearchAndDevelopmentExpense 26,977,000us-gaap_ResearchAndDevelopmentExpense 24,746,000us-gaap_ResearchAndDevelopmentExpense 26,975,000us-gaap_ResearchAndDevelopmentExpense 23,599,000us-gaap_ResearchAndDevelopmentExpense 24,650,000us-gaap_ResearchAndDevelopmentExpense 25,312,000us-gaap_ResearchAndDevelopmentExpense 107,726,000us-gaap_ResearchAndDevelopmentExpense 100,536,000us-gaap_ResearchAndDevelopmentExpense 96,004,000us-gaap_ResearchAndDevelopmentExpense
Acquired in-process research and development (Note 2)     15,456,000us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff               15,456,000us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff    
Purchased intangibles amortization     2,616,000wat_PurchasedIntangiblesAmortization 2,725,000wat_PurchasedIntangiblesAmortization 2,646,000wat_PurchasedIntangiblesAmortization 2,647,000wat_PurchasedIntangiblesAmortization 2,625,000wat_PurchasedIntangiblesAmortization 2,518,000wat_PurchasedIntangiblesAmortization 2,382,000wat_PurchasedIntangiblesAmortization 2,393,000wat_PurchasedIntangiblesAmortization 10,634,000wat_PurchasedIntangiblesAmortization 9,918,000wat_PurchasedIntangiblesAmortization 13,829,000wat_PurchasedIntangiblesAmortization
Litigation provisions (Note 10) 4,000,000us-gaap_GainLossRelatedToLitigationSettlement 3,000,000us-gaap_GainLossRelatedToLitigationSettlement                     7,434,000us-gaap_GainLossRelatedToLitigationSettlement
Operating income     172,039,000us-gaap_OperatingIncomeLoss 138,713,000us-gaap_OperatingIncomeLoss 118,395,000us-gaap_OperatingIncomeLoss 88,761,000us-gaap_OperatingIncomeLoss 176,177,000us-gaap_OperatingIncomeLoss 119,069,000us-gaap_OperatingIncomeLoss 112,692,000us-gaap_OperatingIncomeLoss 109,405,000us-gaap_OperatingIncomeLoss 517,908,000us-gaap_OperatingIncomeLoss 517,343,000us-gaap_OperatingIncomeLoss 511,490,000us-gaap_OperatingIncomeLoss
Other expense (Note 3)                 (1,575,000)us-gaap_GainLossOnInvestments     (1,575,000)us-gaap_GainLossOnInvestments  
Interest expense     (9,669,000)us-gaap_InterestExpense (9,062,000)us-gaap_InterestExpense (7,971,000)us-gaap_InterestExpense (7,489,000)us-gaap_InterestExpense (7,927,000)us-gaap_InterestExpense (7,358,000)us-gaap_InterestExpense (7,580,000)us-gaap_InterestExpense (7,185,000)us-gaap_InterestExpense (34,191,000)us-gaap_InterestExpense (30,050,000)us-gaap_InterestExpense (28,073,000)us-gaap_InterestExpense
Interest income     2,103,000us-gaap_InvestmentIncomeInterest 1,762,000us-gaap_InvestmentIncomeInterest 1,700,000us-gaap_InvestmentIncomeInterest 1,458,000us-gaap_InvestmentIncomeInterest 1,075,000us-gaap_InvestmentIncomeInterest 946,000us-gaap_InvestmentIncomeInterest 1,179,000us-gaap_InvestmentIncomeInterest 1,187,000us-gaap_InvestmentIncomeInterest 7,023,000us-gaap_InvestmentIncomeInterest 4,387,000us-gaap_InvestmentIncomeInterest 4,208,000us-gaap_InvestmentIncomeInterest
Income from operations before income taxes     164,473,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 131,413,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 112,124,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 82,730,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 169,325,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 112,657,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 104,716,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 103,407,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 490,740,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 490,105,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 487,625,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income tax (benefit) expense     13,181,000us-gaap_IncomeTaxExpenseBenefit 17,916,000us-gaap_IncomeTaxExpenseBenefit 15,595,000us-gaap_IncomeTaxExpenseBenefit 12,428,000us-gaap_IncomeTaxExpenseBenefit 27,743,000us-gaap_IncomeTaxExpenseBenefit 14,609,000us-gaap_IncomeTaxExpenseBenefit 15,402,000us-gaap_IncomeTaxExpenseBenefit (17,652,000)us-gaap_IncomeTaxExpenseBenefit 59,120,000us-gaap_IncomeTaxExpenseBenefit 40,102,000us-gaap_IncomeTaxExpenseBenefit 26,182,000us-gaap_IncomeTaxExpenseBenefit
Net income     151,292,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 113,497,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 96,529,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 70,302,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 141,582,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 98,048,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 89,314,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 121,059,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 431,620,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 450,003,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 461,443,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income per basic common share     $ 1.82us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.36us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.83us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.67us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.04us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.41us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 5.12us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 5.27us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 5.25us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Weighted-average number of basic common shares     83,217us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,663us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,462us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,977us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,006us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,185us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,482us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 86,049us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 85,426us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 87,841us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income per diluted common share     $ 1.80us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.34us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.13us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.82us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.65us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.03us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.39us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 5.07us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 5.20us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 5.19us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Weighted-average number of diluted common shares and equivalents     84,015us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 84,401us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,177us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,873us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 86,017us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 86,364us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 86,576us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 87,215us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,151us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 86,546us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 88,979us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Related to Fiscal Year 2012 [Member]                          
Components of Income Tax Expense (Benefit) [Line Items]                          
R&D Tax Credit                   $ 3,000,000us-gaap_IncomeTaxReconciliationTaxCreditsResearch
/ wat_NatureOfTaxProvisionAxis
= wat_RelatedToFiscalYear2012Member		   $ 3,000,000us-gaap_IncomeTaxReconciliationTaxCreditsResearch
/ wat_NatureOfTaxProvisionAxis
= wat_RelatedToFiscalYear2012Member