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Reinsurance - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reinsurance [Line Items]
Property and casualty premiums earned, Ceded	$ 800.8	$ 539.2	$ 304.4
Property and casualty losses and LAE, Ceded	588.4	422.1	242.4
Reinsurance recoverable	2,479.7	2,262.2
MCCA
Reinsurance [Line Items]
Property and casualty premiums earned, Ceded	74.0	69.6	64.7
Property and casualty losses and LAE, Ceded	99.9	122.6	135.6
Percentage of reinsurance receivable represented by segment	34.50%
Percentage of reinsurance assets represented by segment, minimum	10.00%
Reinsurance recoverable	$ 856.3	$ 816.7

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance.

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