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Basis of Presentation (Details) | 6 Months Ended
--- | ---
Jun. 30, 2013
Basis of Presentation |
Length of fiscal year | 364 days
Length of fiscal quarter | 91 days
Length of half fiscal year | 182 days

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the length of fiscal quarter of the entity. + References No definition available. + Details
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Namespace Prefix: | wts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the length of fiscal year of the entity. + References No definition available. + Details
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Namespace Prefix: | wts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the length of half fiscal year of the entity. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration