Related-Party Transactions (Affiliated Quota Share Reinsurance Agreements For All New And Renewal Business For The Indicated Coverage Period) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Everest Re [Member] | 01/01/2002-12/31/2002 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	20.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2003-12/31/2003 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	25.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2004-12/31/2005 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	22.50%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2004-12/31/2005 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	2.50%
Assuming Company	Everest International
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2006-12/31/2006 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	18.00%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	125,000	[1]
Everest Re [Member] | 01/01/2006-12/31/2006 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	2.00%
Assuming Company	Everest International
Type of Business	property business
Everest Re [Member] | 01/01/2006-12/31/2007 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	31.50%
Assuming Company	Bermuda Re
Type of Business	casualty business
Everest Re [Member] | 01/01/2006-12/31/2007 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	3.50%
Assuming Company	Everest International
Type of Business	casualty business
Everest Re [Member] | 01/01/2007-12/31/2007 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	22.50%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	130,000	[1]
Everest Re [Member] | 01/01/2007-12/31/2007 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	2.50%
Assuming Company	Everest International
Type of Business	property business
Everest Re [Member] | 01/01/2008-12/31/2008 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	36.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	130,000	[1]
Aggregate Limit	275,000	[2]
Everest Re [Member] | 01/01/2008-12/31/2008 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	4.00%
Assuming Company	Everest International
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2009-12/31/2009 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	36.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	150,000	[1]
Aggregate Limit	325,000	[2]
Everest Re [Member] | 01/01/2009-12/31/2009 [Member] | Everest International [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	8.00%
Assuming Company	Everest International
Type of Business	property / casualty business
Everest Re [Member] | 01/01/2010-12/31/2010 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	44.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	150,000
Aggregate Limit	325,000
Everest Re [Member] | 01/01/2011 -12/31/2011 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	150,000
Aggregate Limit	300,000
Everest Re [Member] | 01/01/2012 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	100,000
Aggregate Limit	200,000
Everest Re- Canadian Branch [Member] | 01/01/2010-12/31/2010 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	350,000	[3]
Everest Re- Canadian Branch [Member] | 01/01/2011 -12/31/2011 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property business
Single Occurrence Limit	350,000	[3]
Everest Re- Canadian Branch [Member] | 01/01/2012 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	75.00%
Assuming Company	Bermuda Re
Type of Business	property / casualty business
Single Occurrence Limit	206,250	[3]
Aggregate Limit	412,500	[3]
Everest Re- Canadian Branch [Member] | 01/01/2012 [Member] | Everest Canada [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Canada
Percent Ceded	80.00%
Assuming Company	Everest Re- Canadian Branch
Type of Business	property business
Everest Re- Canadian Branch [Member] | 01/01/2003-12/31/2006 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	50.00%
Assuming Company	Bermuda Re
Type of Business	property business
Everest Re- Canadian Branch [Member] | 01/01/2007-12/31/2009 [Member] | Bermuda Re [Member]
Related Party Transaction [Line Items]
Ceding Company	Everest Re- Canadian Branch
Percent Ceded	60.00%
Assuming Company	Bermuda Re
Type of Business	property business

[1] The single occurance limit is applied before the loss cessions to either Bermuda Re or Everest International.

[2] The aggregate limit is applied before the loss cessions to either Bermuda Re or Everest International.

[3] Amounts shown are Canadian dollars.