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Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 2 Months Ended | 1 Months Ended | 4 Months Ended | 6 Months Ended
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Jun. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |
Unrealized Gains (Losses) on Available-for-Sale Securities, Net realized investment gains | $ 18,472 | $ 7,267 | $ 13,349 |
Unrealized Gains (Losses) on Available-for-Sale Securities, Tax (expense) benefit |  |  |  |
Unrealized Gains (Losses) on Available-for-Sale Securities, Net of tax and noncontrolling interest | 18,472 | 7,267 | 13,349 |
Amortization of Postretirement Benefit, Prior service cost |  | 92 | (1,616) |
Amortization of Postretirement Benefit, Actuarial gains (losses) |  | (173) | 727 |
Amortization of Postretirement Benefit, Total before tax |  | (81) | (889) |
Amortization of Postretirement, Tax (expense) benefit |  | (704) | (704) |
Amortization of Postretirement, Net of tax and noncontrolling interest |  | 623 | (185) | 3,792
Total reclassifications for the period | $ 18,472 | $ (7,890) | $ (13,164) |

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- Definition Before tax amount, net of reclassification adjustments, of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 + Details
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