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Results Under Our Historical Method and Our Results Had We Applied New Methods (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2011 | Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,158,436 |  | $ 694,841 |  | $ 550,501
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (79,353) |  | 46,417 |  | 88,943
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (104,612) |  | (3,151) |  | 190,032
Net income (loss) attributable to Pentair Ltd. | (273,083) |  | 31,363 |  | 72,775 |  | 61,759 |  | (174,487) |  | 50,648 |  | 66,280 |  | 50,109 |  | (107,186) |  | (7,450) |  | 184,913
Amortization of pension and other post-retirement prior service cost and transition obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 253 |  | 11 |  | (153)
Basic earnings (loss) per share attributable to Pentair Ltd. | $ (1.31) | [1] | $ 0.31 | [1] | $ 0.73 | [1] | $ 0.63 | [1] | $ (1.77) | [1] | $ 0.51 | [1] | $ 0.67 | [1] | $ 0.51 | [1] | $ (0.84) | [1] | $ (0.08) | [1] | $ 1.88
Diluted earnings (loss) per share attributable to Pentair Ltd. | $ (1.31) | [1] | $ 0.31 | [1] | $ 0.72 | [1] | $ 0.62 | [1] | $ (1.77) | [1] | $ 0.50 | [1] | $ 0.66 | [1] | $ 0.50 | [1] | $ (0.84) | [1] | $ (0.08) | [1] | $ 1.86
Retained earnings | 1,292,288 |  |  |  |  |  |  |  | 1,465,780 |  |  |  |  |  |  |  | 1,292,288 |  | 1,465,780 |  |
Accumulated other comprehensive income (loss) | (7,198) |  |  |  |  |  |  |  | (37,731) |  |  |  |  |  |  |  | (7,198) |  | (37,731) |  |
Net income (loss) before noncontrolling interest | (274,736) |  | 32,595 |  | 74,430 |  | 63,099 |  | (174,068) |  | 51,610 |  | 67,705 |  | 51,602 |  | (104,612) |  | (3,151) |  | 189,406
Pension and other post-retirement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,536 |  | 84,345 |  | 34,098
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,178 |  | (7,954) |  | (795)
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,016,698 |  | 626,527 |  | 529,329
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24,076) |  | 73,059 |  | 97,200
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,151) |  | 38,521 |  | 202,947
Net income (loss) attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,725) |  | 34,222 |  | 197,828
Amortization of pension and other post-retirement prior service cost and transition obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (86,714) |  | (41,683) |  | (12,762)
Basic earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) |  | $ 0.35 |  | $ 2.01
Diluted earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.16) |  | $ 0.34 |  | $ 1.99
Retained earnings | 1,492,258 |  |  |  |  |  |  |  | 1,579,290 |  |  |  |  |  |  |  | 1,492,258 |  | 1,579,290 |  |
Accumulated other comprehensive income (loss) | (207,168) |  |  |  |  |  |  |  | (151,241) |  |  |  |  |  |  |  | (207,168) |  | (151,241) |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,151) |  | 38,521 |  | 202,321
Pension and other post-retirement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,798 |  | 16,031 |  | 12,926
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,455 |  | 18,688 |  | 7,462
Adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,158,436 |  | 694,841 |  | 550,501
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (79,353) |  | 46,417 |  | 88,943
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (104,612) |  | (3,151) |  | 190,032
Net income (loss) attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (107,186) |  | (7,450) |  | 184,913
Amortization of pension and other post-retirement prior service cost and transition obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (253) |  | (11) |  | 153
Basic earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.84) |  | $ (0.08) |  | $ 1.88
Diluted earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.84) |  | $ (0.08) |  | $ 1.86
Retained earnings | 1,292,288 |  |  |  |  |  |  |  | 1,465,780 |  |  |  |  |  |  |  | 1,292,288 |  | 1,465,780 |  |
Accumulated other comprehensive income (loss) | (7,198) |  |  |  |  |  |  |  | (37,731) |  |  |  |  |  |  |  | (7,198) |  | (37,731) |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (104,612) |  | (3,151) |  | 189,406
Pension and other post-retirement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,536 |  | 84,345 |  | 34,098
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,178 |  | (7,954) |  | (795)
Effect of Accounting Principle Change |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,738 |  | 68,314 |  | 21,172
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (55,277) |  | (26,642) |  | (8,257)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (86,461) |  | (41,672) |  | (12,915)
Net income (loss) attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (86,461) |  | (41,672) |  | (12,915)
Amortization of pension and other post-retirement prior service cost and transition obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,461 |  | 41,672 |  | 12,915
Basic earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.68) |  | $ (0.43) |  | $ (0.13)
Diluted earnings (loss) per share attributable to Pentair Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.68) |  | $ (0.42) |  | $ (0.13)
Retained earnings | (199,970) |  |  |  |  |  |  |  | (113,510) |  |  |  |  |  |  |  | (199,970) |  | (113,510) |  |
Accumulated other comprehensive income (loss) | 199,970 |  |  |  |  |  |  |  | 113,510 |  |  |  |  |  |  |  | 199,970 |  | 113,510 |  |
Net income (loss) before noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (86,461) |  | (41,672) |  | (12,915)
Pension and other post-retirement expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,738 |  | 68,314 |  | 21,172
Other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (55,277) |  | $ (26,642) |  | $ (8,257)
[1] | Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average common shares outstanding during that period.

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