Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) (Successor [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in one year or less	$ 413,150
Amortized Cost, Due after one year through five years	927,630
Amortized Cost, Due after five years through ten years	994,286
Amortized Cost, Due after ten years	213,586
Amortized Cost, Total	2,548,652
Amortized Cost	4,958,298	4,939,325
Estimated Fair Value, Due in one year or less	413,291
Estimated Fair Value, Due after one year through five years	935,442
Estimated Fair Value, Due after five years through ten years	1,013,939
Estimated Fair Value, Due after ten years	217,966
Estimated Fair Value due, Total	2,580,638
Fixed income securities	5,151,543us-gaap_AvailableForSaleSecurities	5,150,018us-gaap_AvailableForSaleSecurities
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,672,886	4,514,878
Fixed income securities	4,865,750	4,725,686
Fixed Income Securities [Member] \| Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,705,246	1,557,059
Fixed income securities	1,846,477	1,710,955
Fixed Income Securities [Member] \| Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	88,569	21,346
Fixed income securities	88,238	21,122
Fixed Income Securities [Member] \| Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	615,831	833,366
Fixed income securities	$ 636,190	$ 882,001

Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) (Successor [Member], USD $)
In Thousands, unless otherwise specified

Mar. 31, 2015

Dec. 31, 2014

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost, Due in one year or less

$ 413,150us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost

Amortized Cost, Due after one year through five years

927,630us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost

Amortized Cost, Due after five years through ten years

994,286us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost

Amortized Cost, Due after ten years

213,586us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost

Amortized Cost, Total

2,548,652us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis

Amortized Cost

4,958,298us-gaap_AvailableForSaleSecuritiesAmortizedCost

4,939,325us-gaap_AvailableForSaleSecuritiesAmortizedCost

Estimated Fair Value, Due in one year or less

413,291us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

Estimated Fair Value, Due after one year through five years

935,442us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

Estimated Fair Value, Due after five years through ten years

1,013,939us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

Estimated Fair Value, Due after ten years

217,966us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

Estimated Fair Value due, Total

2,580,638us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

Fixed income securities

5,151,543us-gaap_AvailableForSaleSecurities

5,150,018us-gaap_AvailableForSaleSecurities

Fixed Income Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

4,672,886us-gaap_AvailableForSaleSecuritiesAmortizedCost
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4,514,878us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Fixed income securities

4,865,750us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

4,725,686us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,705,246us-gaap_AvailableForSaleSecuritiesAmortizedCost
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= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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= us-gaap_SuccessorMember

1,557,059us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Fixed income securities

1,846,477us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
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1,710,955us-gaap_AvailableForSaleSecurities
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= us-gaap_ResidentialMortgageBackedSecuritiesMember
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= us-gaap_SuccessorMember

Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

88,569us-gaap_AvailableForSaleSecuritiesAmortizedCost
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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= us-gaap_SuccessorMember

21,346us-gaap_AvailableForSaleSecuritiesAmortizedCost
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Fixed income securities

88,238us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

21,122us-gaap_AvailableForSaleSecurities
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= us-gaap_CollateralizedDebtObligationsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

Fixed Income Securities [Member] | Asset-backed Securities [Member]

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

615,831us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

833,366us-gaap_AvailableForSaleSecuritiesAmortizedCost
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_StatementScenarioAxis
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Fixed income securities

$ 636,190us-gaap_AvailableForSaleSecurities
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/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember

$ 882,001us-gaap_AvailableForSaleSecurities
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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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