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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Insurance [Abstract]
Reinsurance on premiums written, Direct	$ (3,530)	$ (92,594)
Reinsurance on premiums written, Assumed
Reinsurance on premiums written, Ceded	1,014	16,854
Reinsurance on premiums written, Net	(2,516)	(75,740)
Reinsurance on premiums earned, Direct	107,079	97,148
Reinsurance on premiums earned, Assumed	24	25
Reinsurance on premiums earned, Ceded	(6,847)	(2,223)
Reinsurance on premiums earned, Net	$ 100,256	$ 94,950

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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