XML 162 R130.htm IDEA: XBRL DOCUMENT v2.4.1.9
Employment Benefit Plans Performance Units (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Target Units 100.00%ambc_TargetUnits  
Performance Stock Expense Cash Component $ 190ambc_PerformanceStockExpenseCashComponent  
PerformanceStockUnitsUnrecognizedCompensationExpense $ 1,460ambc_PerformanceStockUnitsUnrecognizedCompensationExpense  
Performance Award Scheduled Vesting Period 3 years  
PerformanceAwardsSettlementPeriod 0 months 60 days  
PSUUnrecognizedCompensationYearstoGo 2 years 3 months 18 days  
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance Award Payout 0.00%ambc_PerformanceAwardPayout
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance Award Payout 200.00%ambc_PerformanceAwardPayout
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Successor [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Performance Awards Number 35,412ambc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceAwardsNumber
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0ambc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformanceAwardsNumber
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Successor [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 49,011us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 29.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsPerformance AwardsVestedInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (13,599)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 29.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 29.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember