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Selected Quarterly Data - Increase (Reduction) to Previously Reported Quarterly Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
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
Operating income (loss) $ (304,106) $ 55,199 $ 119,314 $ 86,474 $ (186,175) $ 92,195 $ 108,714 $ 85,469 $ (43,119) $ 100,203 $ 312,983
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
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
Earnings (loss) per common share attributable to Pentair Ltd.                      
Basic $ (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 $ (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
Previously Reported
                     
Operating income (loss) (146,304) 1,522 1,522 1,522 (66,190) (708) (708) (708) (141,738) (68,314)  
Net income (loss) before noncontrolling interest (89,296) 945 945 945 (40,376) (432) (432) (432) (86,461) (41,672)  
Net income (loss) attributable to Pentair Ltd. $ (89,296) $ 945 $ 945 $ 945 $ (40,376) $ (432) $ (432) $ (432) $ (86,461) $ (41,672)  
Earnings (loss) per common share attributable to Pentair Ltd.                      
Basic $ (0.43) [2] $ 0.01 [2] $ 0.01 [2] $ 0.01 [2] $ (0.41) [2] $ (0.01) [2] $ (0.01) [2] $ (0.01) [2] $ (0.68) [2] $ (0.42) [2]  
Diluted $ (0.43) [2] $ 0.01 [2] $ 0.01 [2] $ 0.01 [2] $ (0.41) [2] $ (0.01) [2] $ (0.01) [2] $ (0.01) [2] $ (0.68) [2] $ (0.42) [2]  
[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
[2] 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.