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Stock-based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended
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Sep. 29, 2012 | Oct. 01, 2011 | Sep. 29, 2012 | Oct. 01, 2011 | Dec. 31, 2011 | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Stock Option | Oct. 01, 2011 2008 Omnibus Stock Incentive Plan Stock Option | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Stock Option | Oct. 01, 2011 2008 Omnibus Stock Incentive Plan Stock Option | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units | Oct. 01, 2011 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units | Oct. 01, 2011 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units Minimum | Sep. 29, 2012 2008 Omnibus Stock Incentive Plan Restricted Shares and Restricted Stock Units Maximum | Sep. 29, 2012 2012 Stock and Incentive Plan | Sep. 28, 2012 2012 Stock and Incentive Plan | Sep. 29, 2012 2012 Stock and Incentive Plan Active Employees | Sep. 29, 2012 2012 Stock and Incentive Plan Non Employees | Sep. 29, 2012 Pentair Ltd | Sep. 29, 2012 Pentair Ltd
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ 18.4 | $ 4.2 | $ 28.5 | $ 14.7 |  | $ 5.6 | $ 2.0 | $ 9.9 | $ 6.7 | $ 12.8 | $ 2.2 | $ 18.6 | $ 8.0 |  |  |  |  |  |  | $ 13.5 | $ 13.5
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |
Number of shares authorized for issuance | 213,000,000 | 250,000,000 | 213,000,000 | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |
Business Acquisition Equity Interest Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 108.9 |  | $ 37.6 | $ 71.3 |  |
Common shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |
Stock awards, weighted average grant-date fair value |  |  | $ 13.18 | $ 10.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 99-12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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