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Other Commitments and Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Commitments and Contingencies [Abstract]      
Rental expense $ 30,000,000us-gaap_LeaseAndRentalExpense $ 30,000,000us-gaap_LeaseAndRentalExpense $ 30,000,000us-gaap_LeaseAndRentalExpense
Future minimum rents payable, year 1 21,945,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Future minimum rents payable, year 2 17,464,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Future minimum rents payable, year 3 12,760,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Future minimum rents payable, year 4 6,528,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Future minimum rents payable in five years and thereafter 17,473,000wat_FutureMinimumRentsPayableInFiveYearsAndThereafter    
Future minimum license fees payable Future minimum license fees payable under existing license agreements as of December 31, 2014 are immaterial for the years ended December 31, 2015 and thereafter.    
Potential payments under licensing arrangements $ 15,000,000wat_PotentialPaymentsUnderLicensingArrangements