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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands | 3 Months Ended
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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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