Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended					9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Malta [Member]	Sep. 30, 2013 Brazil [Member]	Sep. 30, 2013 ARIS [Member]	Sep. 30, 2013 PXRE Reinsurance Company [Member]	Sep. 30, 2012 December 31, 2025 [Member]	Sep. 30, 2012 December 31, 2027 [Member]
Income Tax Contingency [Line Items]
Total net deferred tax assets	$ 24.2
Capital loss carryforward	30.0
Net operating loss carryforward	18.7			1.0
Loss carryforwards, amounts expiring if not utilized						17.2	1.5
Valuation allowance	54.9
Loss carryforwards per year	2.8
Reduced valuation allowance					0.7
Increased valuation allowance		$ 0.4	$ 2.7