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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Capital lease obligations [Member]
Dec. 31, 2010
Capital lease obligations [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Dec. 31, 2011
4.60% Series E senior notes [Member]
Dec. 31, 2011
6.00% Series F senior notes [Member]
Dec. 31, 2011
6.03% Series A senior notes [Member]
Dec. 31, 2011
6.13% Series G senior notes [Member]
Dec. 31, 2011
6.13% Series G senior notes [Member]
Prudential senior notes [Member]
Dec. 31, 2010
6.13% Series G senior notes [Member]
Prudential senior notes [Member]
Dec. 31, 2011
5.84% Series H senior notes due in 2013 [Member]
Dec. 31, 2011
5.84% Series H senior notes due in 2013 [Member]
Prudential senior notes [Member]
Dec. 31, 2010
5.84% Series H senior notes due in 2013 [Member]
Prudential senior notes [Member]
Dec. 31, 2011
5.84% Series H senior notes due in 2015 [Member]
Dec. 31, 2011
5.84% Series H senior notes due in 2015 [Member]
Prudential senior notes [Member]
Dec. 31, 2010
5.84% Series H senior notes due in 2015 [Member]
Prudential senior notes [Member]
Dec. 31, 2011
6.28% Series I senior notes due in 2013 [Member]
Dec. 31, 2011
6.28% Series I senior notes due in 2013 [Member]
Prudential senior notes [Member]
Dec. 31, 2010
6.28% Series I senior notes due in 2013 [Member]
Prudential senior notes [Member]
Dec. 31, 2011
6.28% Series I senior notes due in 2015 [Member]
Dec. 31, 2011
6.28% Series I senior notes due in 2015 [Member]
Prudential senior notes [Member]
Dec. 31, 2010
6.28% Series I senior notes due in 2015 [Member]
Prudential senior notes [Member]
Dec. 31, 2011
6.85% Series J senior notes [Member]
Dec. 31, 2011
6.85% Series J senior notes [Member]
Prudential senior notes [Member]
Dec. 31, 2010
6.85% Series J senior notes [Member]
Prudential senior notes [Member]
Dec. 31, 2011
6.16% Series B senior notes [Member]
Dec. 31, 2011
6.16% Series B senior notes [Member]
Principal senior notes [Member]
Dec. 31, 2010
6.16% Series B senior notes [Member]
Principal senior notes [Member]
Dec. 31, 2011
5.87% Series A senior notes due in 2013 [Member]
Dec. 31, 2011
5.87% Series A senior notes due in 2013 [Member]
New York Life senior notes [Member]
Dec. 31, 2010
5.87% Series A senior notes due in 2013 [Member]
New York Life senior notes [Member]
Dec. 31, 2011
5.87% Series A senior notes due in 2015 [Member]
Dec. 31, 2011
5.87% Series A senior notes due in 2015 [Member]
New York Life senior notes [Member]
Dec. 31, 2010
5.87% Series A senior notes due in 2015 [Member]
New York Life senior notes [Member]
Dec. 31, 2011
6.35% Series B senior notes [Member]
Dec. 31, 2011
6.35% Series B senior notes [Member]
New York Life senior notes [Member]
Dec. 31, 2010
6.35% Series B senior notes [Member]
New York Life senior notes [Member]
Dec. 31, 2011
6.46% Series A senior notes [Member]
Dec. 31, 2011
6.46% Series A senior notes [Member]
Aviva Investors North America [Member]
Dec. 31, 2010
6.46% Series A senior notes [Member]
Aviva Investors North America [Member]
Dec. 31, 2011
5.80% senior notes due in 2021 [Member]
Apr. 06, 2011
5.80% senior notes due in 2021 [Member]
Dec. 31, 2011
5.80% senior notes due in 2021 [Member]
Verisk senior notes [Member]
Dec. 31, 2010
5.80% senior notes due in 2021 [Member]
Verisk senior notes [Member]
Dec. 08, 2011
4.875% senior notes due in 2019 [Member]
Dec. 31, 2011
4.875% senior notes due in 2019 [Member]
Verisk senior notes [Member]
Dec. 31, 2010
4.875% senior notes due in 2019 [Member]
Verisk senior notes [Member]
Dec. 31, 2011
Syndicated revolving credit facility [Member]
Dec. 31, 2010
Syndicated revolving credit facility [Member]
Dec. 31, 2011
Prudential senior notes [Member]
4.60% Series E senior notes [Member]
Dec. 31, 2010
Prudential senior notes [Member]
4.60% Series E senior notes [Member]
Dec. 31, 2011
Prudential senior notes [Member]
6.00% Series F senior notes [Member]
Dec. 31, 2010
Prudential senior notes [Member]
6.00% Series F senior notes [Member]
Dec. 31, 2011
Principal senior notes [Member]
6.03% Series A senior notes [Member]
Dec. 31, 2010
Principal senior notes [Member]
6.03% Series A senior notes [Member]
Dec. 31, 2011
Capital lease obligations [Member]
Dec. 31, 2010
Capital lease obligations [Member]
Dec. 31, 2011
Other [Member]
Dec. 31, 2010
Other [Member]
Short-term Debt [Line Items]                                                                                                                          
Short term debt instrument issuance date                                                                                                       Jun. 14, 2005   Aug. 08, 2006   Aug. 08, 2006          
Short term debt instrument maturity date                                                                                                       Jun. 13, 2011   Aug. 08, 2011   Aug. 08, 2011          
Short-term debt and current portion of long-term debt $ 5,554 $ 437,717                                                                                               $ 0 $ 310,000 $ 0 $ 50,000 $ 0 $ 25,000 $ 0 $ 50,000 $ 5,267 $ 2,429 $ 287 $ 288
Short term debt instrument interest rate stated percentage             4.60% 6.00% 6.03% 6.13%     5.84%     5.84%     6.28%     6.28%     6.85%     6.16%     5.87%     5.87%     6.35%     6.46%     5.80% 5.80%     4.875%                            
Debt Instrument [Line Items]                                                                                                                          
Debt Instrument, Issuance Date                     2006-08-08     2007-10-26     2007-10-26     2008-04-29     2008-04-29     2009-06-15     2006-08-08     2007-10-26     2007-10-26     2008-04-29     2009-04-27       2011-04-06     2011-12-08                          
Debt Instrument, Maturity Date                     Aug. 08, 2013     Oct. 26, 2013     Oct. 26, 2015     Apr. 29, 2013     Apr. 29, 2015     Jun. 15, 2016     Aug. 08, 2013     Oct. 26, 2013     Oct. 26, 2015     Apr. 29, 2015     Apr. 27, 2013       May 01, 2021     Jan. 15, 2019                          
Long-term debt 1,100,332 401,826 1,506 1,628 2,169 198         75,000 75,000   17,500 17,500   17,500 17,500   15,000 15,000   85,000 85,000   50,000 50,000   25,000 25,000   17,500 17,500   17,500 17,500   50,000 50,000   30,000 30,000     449,033 0   247,624 0                        
Total debt $ 1,105,886 $ 839,543                                                                                                                      
Bond issued interest rate             4.60% 6.00% 6.03% 6.13%     5.84%     5.84%     6.28%     6.28%     6.85%     6.16%     5.87%     5.87%     6.35%     6.46%     5.80% 5.80%     4.875%