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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Taxes [Line Items]
Effective income tax rate	12.30%	22.90%
Reduction in effective income tax rate as a result of non-recurring merger-related items	10.20%
State net operating loss carry forward	$ 15.2		$ 15.2
Valuation allowance	15.2		15.2
Annual limitation on the use of foreign tax credit carryforwards and minimum tax credit carryforwards by Transatlantic	$ 42.7

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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