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Schedule IV - Reinsurance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross Amount	$ (277,508)	$ (171,283)
Ceded to Other Companies	23,371	20,835
Assumed from Other Companies		(7,670)
Net Amount	$ (254,137)	$ (158,118)
Percentage of Amount Assumed to Net

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Premiums assumed for all financial guarantee insurance contracts assumed from other insurers as a result of reinsurance arrangements.

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