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Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2012 | Apr. 30, 2013 | May 16, 2012
Common Stock |  |  |  |  |  |
Common Stock conversion ratio, at the option of the holder |  | 1 wts_CommonStockOptionalConversionRatio |  |  |  |
Options to purchase shares of Class A common stock |  |  |  |  | $ 90.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Number of shares authorized to be repurchased |  |  |  |  |  | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Number of shares repurchased | 2,000,000 us-gaap_StockRepurchasedDuringPeriodShares | 670,000 us-gaap_StockRepurchasedDuringPeriodShares | 454,000 us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Cost of shares of Class A common stock repurchased | 65.8 us-gaap_StockRepurchasedDuringPeriodValue | 39.6 us-gaap_StockRepurchasedDuringPeriodValue | 23.0 us-gaap_StockRepurchasedDuringPeriodValue |  |  |
Class A |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Common Stock, votes per share (Number of votes) |  | 1 wts_CommonStockVotePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 1 wts_CommonStockVotePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Shares of Common Stock reserved for issuance under stock-based compensation plans |  | 28,552,065 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Options to purchase shares of Class A common stock |  |  |  |  | 90.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Number of shares authorized to be repurchased |  |  |  |  |  | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Number of shares repurchased |  | 670,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 454,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 2,000,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Cost of shares of Class A common stock repurchased |  | $ 39.6 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 23.0 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 65.8 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Class B |  |  |  |  |  |
Common Stock |  |  |  |  |  |
Common Stock, votes per share (Number of votes) |  | 10 wts_CommonStockVotePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 10 wts_CommonStockVotePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Shares of Common Stock reserved for conversion |  | 6,479,290 wts_CommonStockCapitalSharesReservedForConversion / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Shares of common stock reserved for conversion. + References No definition available. + Details
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- Definition Represents the conversion ratio of common stock at the option of the holder. + References No definition available. + Details
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- Definition There is no established public trading market for our Class B Common Stock, which is held exclusively by members of the Horne family. The principal holders of such stock are subject to restrictions on transfer with respect to their shares. Each share of our Class B Common Stock (10 votes per share) is convertible into one share of Class A Common Stock (1 vote per share). + References No definition available. + Details
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