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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Direct Premiums Written	$ 3,346	$ 4,261
Assumed Reinsurance Premiums Written	0	0
Ceded Reinsurance Premiums Written	(501)	(819)
Premiums written, net of reinsurance	(3,847)	(5,080)
Direct Premiums Earned	29,433	32,609
Assumed Reinsurance Premiums Earned	20	19
Ceded Reinsurance Premiums Earned	1,695	1,745
Reinsurance on premiums earned, Net	$ 27,758	$ 30,883

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