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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 Successor Ambac [Member] Corporate Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Collateralized Debt Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Other Commercial Asset-Backed [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Other Commercial Asset-Backed [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |
Coupon rate | 0.345% | 0.88% | 0.67% | 0.345% | 1.05% | 0.71%
Maturity | 20 years 7 months 21 days | 1 month 2 days | 7 years 5 months 16 days | 21 years 1 month 21 days | 1 year 6 months 4 days | 7 years 10 months 10 days
Yield | 6.75% | 1.43% | 4.25% | 6.08% | 5.92% | 7.50%

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- Definition Fair value inputs coupon rate. + References No definition available. + Details
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- Definition Fair value inputs maturity. + References No definition available. + Details
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- Definition Fair value inputs yield. + References No definition available. + Details
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- Details
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