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Employment Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Postemployment Benefits [Abstract] |
Schedule of Expected Benefit Payments [Table Text Block] | The following table sets forth projected benefit payments from Ambac’s postretirement plan over the next ten years for current retirees:
2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021-2025 |  | Total
$ | 312 |  |  | $ | 319 |  |  | $ | 338 |  |  | $ | 358 |  |  | $ | 368 |  |  | $ | 2,276 |  |  | $ | 3,971 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block] | The amount of stock-based compensation expense and corresponding after-tax expense are as follows:
| Successor Ambac |  |  | Predecessor Ambac
|  |  |  |  | Period from May 1 |  |  | Period from Jan 1
| Year Ended December 31, |  | through |  |  | through
| 2015 |  | 2014 |  | December 31, 2013 |  |  | April 30, 2013
Stock options | $ | 956 |  |  | $ | 444 |  |  | $ | 56 |  |  |  | $ | — |
Restricted stock units | 1,257 |  |  | 2,816 |  |  | 1,050 |  |  |  | — |
Performance stock units (1) | 892 |  |  | 190 |  |  | — |  |  |  | — |
Total stock-based compensation | $ | 3,105 |  |  | $ | 3,450 |  |  | $ | 1,106 |  |  |  | $ | — |
Total stock-based compensation (after-tax) | $ | 3,105 |  |  | $ | 3,450 |  |  | $ | 1,106 |  |  |  | $ | — |
(1) | Represents expense related to performance stock units portion of performance awards. Performance awards, except for performance awards issued to Ambac's Chief Executive Officer, are split evenly between performance stock units and cash. Performance awards issued to Ambac's Chief Executive Officer were all in the form of performance stock units. Cash based compensation expense related to performance awards granted to US employees was $892 and $190 for the years ended December 31, 2015 and 2014, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following assumptions were used in estimating the fair value of options on the grant date:
| 2015 |  |  | 2013 |
Risk-free interest rate | 1.283 | % |  | 0.963 | %
Expected volatility | 42.8 | % |  | 50.2 | %
Dividend yield | 0.0 | % |  | 0.0 | %
Expected life | 4.13 years |  |  | 3.33 years |
Weighted-average grant-date fair value per share | $ | 8.69 |  |  | $ | 7.50 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option activity for 2015 is as follows:
| Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Contractual Life ( in years)
Year Ended December 31, 2015 |  |  |  |  |  |  |
Outstanding at beginning of period | 66,668 |  |  | $ | 20.63 |  |  |  |  |
Granted | 110,000 |  |  | 24.55 |  |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |  |
Forfeited or expired | — |  |  | — |  |  |  |  |  |
Outstanding at end of period | 176,668 |  |  | $ | 23.07 |  |  | $ | — |  |  | 5.77
Exercisable | 66,668 |  |  | $ | 20.63 |  |  | $ | — |  |  | 4.98
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | A summary of RSU activity for 2015 is as follows:
| Shares |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 185,800 |  |  | $ | 22.33 |
Granted | 79,281 |  |  | 23.71 |
Delivered or returned to plan (1) | (56,579 | ) |  | 20.63 |
Forfeited | — |  |  | — |
Outstanding at end of period | 208,502 |  |  | $ | 23.32 |
(1) | When restricted stock unit awards issued by Ambac become taxable compensation to employees, shares may be withheld to cover the employee’s withholding taxes. For the year ended December 31, 2015, Ambac purchased 24,268 of shares from employees that settled restricted stock units to meet the required tax withholdings.
Schedule of Nonvested Performance-based Units Activity [Table Text Block] | A summary of PSU activity for 2015 is as follows:
| Shares(1) |  | Weighted Average Grant Date Fair Value
Outstanding at beginning of period | 35,412 |  |  | $ | 29.78 |
Granted | 107,852 |  |  | 24.62 |
Delivered | — |  |  | — |
Forfeited | (12,719 | ) |  | 25.78 |
Outstanding at end of period | 130,545 |  |  | $ | 25.91 |
(1) | Represents performance share units at 100% of units granted for LTIP Awards.

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) currently exercisable (or convertible). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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