Condensed Consolidated Guarantor Financial Statements (Schedule of Condensed Consolidating Cash Flows) (Details) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Net income	$ 102,420	$ 317,699
Equity in earnings of consolidated subsidiaries
Dividends received from subsidiaries
Stock compensation expense	12,112	17,454
Amortization of discount on senior notes	122	65
Other assets	(359,507)	(342,580)
Accounts payable and accrued liabilities	608,889	311,145
Interest payable
Balances due to subsidiaries
Net cash provided by (used in) operating activities	364,036	303,783
Net cash paid for acquisitions
Purchases of fixed maturity investments - available for sale	(352)	(113,118)
Purchases of fixed maturity investments - trading	(3,949,447)	(6,927,637)
Purchases of equity securities and other invested assets	(485,750)	(203,011)
Sales of fixed maturity investments - available for sale	560,794	1,827,800
Sales of fixed maturity investments - trading	3,503,758	5,344,007
Sale of equity securities and other invested assets	72,362	3,155
Other	27,204	(18,856)
Net cash used in investing activities	(271,431)	(87,660)
Dividends paid		(20,109)
Proceeds from the exercise of stock options	4,824	3,576
Share repurchases	(60,000)	(49,089)
Repurchase of founder warrants	(53,620)
Stock compensation funding due from subsidiaries
Capital contribution
Other
Net cash (used in) provided by financing activities	(108,796)	(65,622)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(16,191)	150,501
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	756,995	292,188
CASH AND CASH EQUIVALENTS, END OF PERIOD	740,804	442,689
Allied World Switzerland (Parent Guarantor) [Member]
Net income	102,420
Equity in earnings of consolidated subsidiaries	(108,184)
Dividends received from subsidiaries
Stock compensation expense	457
Amortization of discount on senior notes
Other assets	(216)
Accounts payable and accrued liabilities	(2,490)
Interest payable
Balances due to subsidiaries
Net cash provided by (used in) operating activities	(8,013)
Net cash paid for acquisitions
Purchases of fixed maturity investments - available for sale
Purchases of fixed maturity investments - trading
Purchases of equity securities and other invested assets
Sales of fixed maturity investments - available for sale
Sales of fixed maturity investments - trading
Sale of equity securities and other invested assets
Other	(4,496)
Net cash used in investing activities	(4,496)
Dividends paid
Proceeds from the exercise of stock options	4,824
Share repurchases	(60,000)
Repurchase of founder warrants
Stock compensation funding due from subsidiaries
Capital contribution
Other	(216)
Net cash (used in) provided by financing activities	(55,392)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(67,901)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	138,488
CASH AND CASH EQUIVALENTS, END OF PERIOD	70,587
Allied World Bermuda (Subsidiary Issuer) [Member]
Net income	(31,918)	317,699
Equity in earnings of consolidated subsidiaries		(347,346)
Dividends received from subsidiaries		80,000
Stock compensation expense		295
Amortization of discount on senior notes	122	65
Other assets	(928)	847
Accounts payable and accrued liabilities	(36)	5,789
Interest payable
Balances due to subsidiaries
Net cash provided by (used in) operating activities	(32,760)	57,349
Net cash paid for acquisitions
Purchases of fixed maturity investments - available for sale
Purchases of fixed maturity investments - trading
Purchases of equity securities and other invested assets
Sales of fixed maturity investments - available for sale
Sales of fixed maturity investments - trading
Sale of equity securities and other invested assets
Other		(2,097)
Net cash used in investing activities		(2,097)
Dividends paid		(20,109)
Proceeds from the exercise of stock options		3,576
Share repurchases		(49,089)
Repurchase of founder warrants	(53,620)
Stock compensation funding due from subsidiaries
Capital contribution
Other	(881)
Net cash (used in) provided by financing activities	(54,501)	(65,622)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(87,261)	(10,370)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	125,663	53,849
CASH AND CASH EQUIVALENTS, END OF PERIOD	38,402	43,479
Other Allied World Subsidiaries [Member]
Net income	140,102	347,346
Equity in earnings of consolidated subsidiaries
Dividends received from subsidiaries
Stock compensation expense	11,655	17,159
Amortization of discount on senior notes
Other assets	(358,363)	(343,427)
Accounts payable and accrued liabilities	611,415	305,356
Interest payable
Balances due to subsidiaries
Net cash provided by (used in) operating activities	404,809	326,434
Net cash paid for acquisitions
Purchases of fixed maturity investments - available for sale	(352)	(113,118)
Purchases of fixed maturity investments - trading	(3,949,447)	(6,927,637)
Purchases of equity securities and other invested assets	(485,750)	(203,011)
Sales of fixed maturity investments - available for sale	560,794	1,827,800
Sales of fixed maturity investments - trading	3,503,758	5,344,007
Sale of equity securities and other invested assets	72,362	3,155
Other	31,700	(16,759)
Net cash used in investing activities	(266,935)	(85,563)
Dividends paid		(80,000)
Proceeds from the exercise of stock options
Share repurchases
Repurchase of founder warrants
Stock compensation funding due from subsidiaries
Capital contribution
Other	1,097
Net cash (used in) provided by financing activities	1,097	(80,000)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	138,971	160,871
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	492,844	238,339
CASH AND CASH EQUIVALENTS, END OF PERIOD	631,815	399,210
Consolidating Adjustments [Member]
Net income	(108,184)	(347,346)
Equity in earnings of consolidated subsidiaries	108,184	347,346
Dividends received from subsidiaries		(80,000)
Stock compensation expense
Amortization of discount on senior notes
Other assets
Accounts payable and accrued liabilities
Interest payable
Balances due to subsidiaries
Net cash provided by (used in) operating activities		(80,000)
Net cash paid for acquisitions
Purchases of fixed maturity investments - available for sale
Purchases of fixed maturity investments - trading
Purchases of equity securities and other invested assets
Sales of fixed maturity investments - available for sale
Sales of fixed maturity investments - trading
Sale of equity securities and other invested assets
Other
Net cash used in investing activities
Dividends paid		80,000
Proceeds from the exercise of stock options
Share repurchases
Repurchase of founder warrants
Stock compensation funding due from subsidiaries
Capital contribution
Other
Net cash (used in) provided by financing activities		80,000
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD
CASH AND CASH EQUIVALENTS, END OF PERIOD

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The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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