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Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Benefit Plans |  |  |
Base contribution as a percentage of employee gross pay (as a percent) | 2.00%wts_DefinedContributionPlanBaseContributionByEmployerPercent |  |
Employer maximum match of an employee's contributions of first 4% of eligible compensation (as a percent) | 100.00%wts_DefinedContributionPlanEmployerMatchLevelOneMaximum |  |
Percentage of eligible compensation, matched 100% by employer | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Company's matching contributions under certain 401(k) savings plans | $ 4.4 us-gaap_DefinedContributionPlanCostRecognized | $ 4.2 us-gaap_DefinedContributionPlanCostRecognized | $ 4.0 us-gaap_DefinedContributionPlanCostRecognized
Employee Benefit Plans |  |  |
Charges for pension plans | 1.5 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | 0.1 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Supplemental compensation agreement with Timothy P. Horne |  |  |
Supplemental compensation paid on an annual basis | 0.6 wts_SupplementalCompensationAgreementAnnualCompensationPaid | 0.6 wts_SupplementalCompensationAgreementAnnualCompensationPaid | 0.6 wts_SupplementalCompensationAgreementAnnualCompensationPaid
Minimum |  |  |
Supplemental compensation agreement with Timothy P. Horne |  |  |
Hours per year required to be worked as a consultant in return for certain annual compensation | 300 hours |  |
Maximum |  |  |
Supplemental compensation agreement with Timothy P. Horne |  |  |
Hours per year required to be worked as a consultant in return for certain annual compensation | 500 hours |  |
EMEA pension plans |  |  |
Employee Benefit Plans |  |  |
Charges for pension plans | $ 5.5 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | $ 5.8 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | $ 6.0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the base contribution as a percentage of employee gross pay which the employer may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the employer maximum matching contribution of the first level of an employee's contributions. + References No definition available. + Details
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- Definition The compensation expense paid during the period pertaining to the supplemental compensation agreement. + References No definition available. + Details
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- Definition Represents the service period per year required to be worked under supplemental compensation agreement in return for certain annual compensation. + References No definition available. + Details
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