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Related Party Transactions - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Acquire non-voting equity interest	$ 256,915,000	$ 297,345,000
Lloyd's Syndicate 2008 [Member]
Related Party Transaction [Line Items]
Percentage of capital commitments funded	100.00%
Accounts payable allocated to minority shareholder	28,100,000
J.C Flowers II L.P. [Member]
Related Party Transaction [Line Items]
Percentage of related party investments associated with Mr. Flowers to total unfunded capital commitments	92.00%
Related party investments, percentage of investments classified as other investments	40.30%
Acquire non-voting equity interest	$ 224,400,000	$ 221,800,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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