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Net Premiums Earned -Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Reinsurance [Line Items]  
Future premiums expected to be collected, December, 31 2012 $ 38,490 [1]
Future premiums expected to be collected, December 31 2013 138,330 [1]
Future premiums expected to be collected, December 31 2014 141,878 [1]
Future premiums expected to be collected, December 31 2015 136,275 [1]
Future premiums expected to be collected, December 31 2016 130,297 [1]
Future premiums expected to be collected, December 31 2021 578,474 [1]
Future premiums expected to be collected, December 31 2026 462,155 [1]
Future premiums expected to be collected, December 31 2031 340,300 [1]
Future premiums expected to be collected, December 31 2036 199,914 [1]
Future premiums expected to be collected, December 31 2041 69,794 [1]
Future premiums expected to be collected, December 31 2046 21,420 [1]
Future premiums expected to be collected, December 31 2051 5,325 [1]
Future premiums expected to be collected, December 31 2056 242 [1]
Future premiums expected to be collected, Total 2,262,894 [1]
Future expected premiums to be earned, net of reinsurance, December 30, 2012 62,992 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2013 226,879 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2014 204,041 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2015 190,320 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2016 179,438 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2021 750,984 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2026 539,033 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2031 357,079 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2036 195,106 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2041 62,902 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2046 19,306 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2051 6,236 [1]
Future expected premiums to be earned, net of reinsurance, December 31, 2056 686 [1]
Future expected premiums to be earned, net of reinsurance, Total $ 2,795,002 [1]
[1] The future premiums expected to be collected and future premiums expected to be earned, net of reinsurance disclosed in the above table relate to the discounted premium receivable asset and unearned premium liability recorded on Ambac's balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable as described above, which results in a higher premium receivable balance than if expected lives were considered. If installment paying policies are retired early as a result of rate step-ups or other early retirement provision incentives for the issuer, premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected in the future.