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Debt and Financing Arrangements (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
$1,000,000 secured letter of credit facility - uncommitted [Member]
Dec. 31, 2012
$1,000,000 secured letter of credit facility - uncommitted [Member]
Dec. 31, 2013
$1,000,000 secured letter of credit facility - uncommitted [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
$800,000 secured letter of credit facility [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
$400,000 unsecured letter of credit facility [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
$400,000 secured letter of credit facility (pre-amendment) [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
$450,000 secured letter of credit facility [Member]
Dec. 31, 2012
$450,000 secured letter of credit facility [Member]
Dec. 31, 2013
$450,000 secured letter of credit facility [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
5.5% Senior notes due 2020 [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Dec. 31, 2013
7.5% Senior notes due 2016 [Member]
Allied World Bermuda (Subsidiary Issuer) [Member]
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount                   $ 300,000 $ 500,000
Senior Notes, interest rate                   5.50% 7.50%
Debt Instrument, Frequency of Periodic Payment                   semi-annually semi-annually
Debt Instrument, Date of First Required Payment                   May 15, 2011 Feb. 01, 2007
Debt Instrument, Maturity Date                   Nov. 15, 2020 Aug. 01, 2016
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000 1,000,000 1,000,000 800,000 400,000 400,000 450,000 450,000 450,000    
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases                 150,000    
Additional commitments subject to lender approval                 $ 150,000    
Line of Credit Facility, Initiation Date       Nov. 27, 2007         Jun. 07, 2012    
Credit facility term       5 years         4 years