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Background and Nature of Operations - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 29, 2012 | Dec. 31, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 31, 2012 Segment | Dec. 31, 2011 | Dec. 31, 2010
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for stock acquisition |  | 213,000,000 |  |  |  | 98,622,564 |  |  |  | 213,000,000 | 98,622,564 |
Conversion of stock description | At the effective time of the Merger, each Pentair, Inc. common share was converted into the right to receive one of our common shares, resulting in 99,388,463 of our common shares being issued to Pentair, Inc. shareholders. |  |  |  |  |  |  |  |  |  |  |
Common shares being issued as a result of conversion of Pentair, Inc. common share | 99,388,463 |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 1,750,932,000 | $ 865,512,000 | $ 941,525,000 | $ 858,177,000 | $ 865,692,000 | $ 890,546,000 | $ 910,175,000 | $ 790,273,000 | $ 4,416,146,000 | $ 3,456,686,000 | $ 3,030,773,000
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | (107,186,000) | (7,450,000) | 185,539,000
Increase in goodwill for fair value adjustments to preliminary purchase price allocation allocation |  | 32,600,000 |  |  |  |  |  |  |  |  |  |
Reporting segments |  |  |  |  |  |  |  |  |  | 3 |  |
Water & Fluid Solutions |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 2,638,403,000 | 2,369,804,000 | 2,041,281,000
Technical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,231,036,000 | 1,086,882,000 | 989,492,000
Valves & Controls |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 546,707,000 |  |
Tyco Flow Control International, Ltd |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |
Shares issued for stock acquisition | 110,898,934 |  | 110,898,934 |  |  |  |  |  |  |  |  |
Goodwill | 2,520,110,000 |  | 2,520,110,000 |  |  |  |  |  |  |  |  |
Intangible assets | 1,400,000,000 |  | 1,400,000,000 |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Water & Fluid Solutions |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 321,400,000 |  | 321,400,000 |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Technical Solutions |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 856,100,000 |  | 856,100,000 |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Valves & Controls |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 1,342,600,000 |  | 1,342,600,000 |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Customer Relationship |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 905,700,000 |  | 905,700,000 |  |  |  |  |  |  |  |  |
Weighted average useful life | 14 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Proprietary technology |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 115,900,000 |  | 115,900,000 |  |  |  |  |  |  |  |  |
Weighted average useful life | 13 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Customer Backlog |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 41,200,000 |  | 41,200,000 |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Customer Backlog | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life | 1 year |  |  |  |  |  |  |  |  |  |  |
Tyco Flow Control International, Ltd | Trade names intangibles |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 362,300,000 |  | 362,300,000 |  |  |  |  |  |  |  |  |
Flow Control |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | 886,500,000 |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ (117,000,000) |  |  |  |  |  |  |  |  |  |
Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |

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