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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (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]
Reinsurance on premiums written, Direct	$ (277,508)	$ (171,283)
Reinsurance on premiums written, Assumed		(7,670)
Reinsurance on premiums written, Ceded	23,371	20,835
Reinsurance on premiums written, Net	(254,137)	(158,118)
Reinsurance on premiums earned, Direct	434,488	429,033
Reinsurance on premiums earned, Assumed	155	(345)
Reinsurance on premiums earned, Ceded	(20,039)	(22,718)
Reinsurance on premiums earned, Net	$ 414,604	$ 405,970

X

- Definition

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

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