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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial assets:
Short term investments	$ 550,900	$ 271,119
Other investments	290,870	241,069
Other assets	12,401	13,384
Financial liabilities:
Obligations under investment and repurchase agreements	160,515	359,070
Long term debt, including accrued interest	1,219,310	963,178
Derivative liabilities	82,830	94,322
Variable Interest Entity [Member]
Financial assets:
Loans at Carrying Amount	12,503,484	13,398,895
Financial liabilities:
Long term debt, including accrued interest	13,159,174	14,091,753
Successor Ambac [Member]
Financial assets:
Fixed income securities	6,771,159	6,282,658
Successor Ambac [Member] | Total Fair Value [Member]
Financial assets:
Cash	43,332	77,370
Loans	6,129	6,238
Other assets	12,401	13,384
Total financial assets	22,369,690	22,590,005
Financial liabilities:
Obligations under investment and repurchase agreements	163,960	360,506
Long term debt, including accrued interest	1,741,594	1,215,029
Liabilities for net financial guarantees written	6,661,100	4,876,617
Total financial liabilities	24,029,546	22,570,109
Successor Ambac [Member] | Total Fair Value [Member] | Variable Interest Entity [Member]
Financial assets:
Restricted cash	7,337	17,498
Loans	12,503,484	13,398,895
Financial liabilities:
Long-term debt	13,159,174	14,091,753
Successor Ambac [Member] | Total Fair Value [Member] | Futures Contracts [Member]
Financial assets:
Derivative assets	1,109	2,337
Financial liabilities:
Derivative liabilities	0
Successor Ambac [Member] | Total Fair Value [Member] | Credit Derivatives [Member]
Financial assets:
Derivative assets	1,052
Financial liabilities:
Derivative liabilities	83,882	94,322
Successor Ambac [Member] | Total Fair Value [Member] | Other Contracts [Member]
Financial liabilities:
Derivative liabilities	137	165
Successor Ambac [Member] | Carrying Amount [Member]
Financial assets:
Cash	43,332	77,370
Loans at Carrying Amount	6,057	6,179
Other assets	12,401	13,384
Total financial assets	22,377,643	22,589,946
Financial liabilities:
Obligations under investment and repurchase agreements	160,515	359,070
Long term debt, including accrued interest	1,595,358	1,256,602
Liabilities for net financial guarantees written	4,580,937	4,509,539
Total financial liabilities	21,799,702	22,243,168
Successor Ambac [Member] | Carrying Amount [Member] | Variable Interest Entity [Member]
Financial assets:
Restricted cash	7,337	17,498
Loans at Carrying Amount	12,503,484	13,398,895
Financial liabilities:
Long-term debt	13,159,174	14,091,753
Successor Ambac [Member] | Carrying Amount [Member] | Futures Contracts [Member]
Financial assets:
Derivative assets	1,109	2,337
Financial liabilities:
Derivative liabilities	0
Successor Ambac [Member] | Carrying Amount [Member] | Credit Derivatives [Member]
Financial assets:
Derivative assets	1,052
Financial liabilities:
Derivative liabilities	83,882	94,322
Successor Ambac [Member] | Carrying Amount [Member] | Other Contracts [Member]
Financial liabilities:
Derivative liabilities	137	165
Successor Ambac [Member] | Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets	89,159	76,631
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	(50,107)	(55,619)
Successor Ambac [Member] | Other Assets [Member] | Carrying Amount [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets	89,159	76,631
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	(50,107)	(55,619)
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Financial liabilities:
Derivative liabilities	314,515	215,030
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,885,244	1,680,834
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Currency Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	70,047	91,472
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Carrying Amount [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0	(1,257)
Financial liabilities:
Derivative liabilities	314,515	215,030
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Carrying Amount [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,885,244	1,680,834
Successor Ambac [Member] | Interest Rate Swaps - Liability Position [Member] | Carrying Amount [Member] | Currency Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	70,047	91,472
Successor Ambac [Member] | Level 1 [Member]
Financial assets:
Cash	43,332	74,425
Loans	0	0
Other assets	0	0
Total financial assets	742,981	614,343
Financial liabilities:
Obligations under investment and repurchase agreements	0	0
Long term debt, including accrued interest	0	0
Liabilities for net financial guarantees written	0	0
Total financial liabilities	0	0
Successor Ambac [Member] | Level 1 [Member] | Variable Interest Entity [Member]
Financial assets:
Restricted cash	7,337	17,498
Loans	0	0
Financial liabilities:
Long-term debt	0	0
Successor Ambac [Member] | Level 1 [Member] | Futures Contracts [Member]
Financial assets:
Derivative assets	1,109	2,337
Financial liabilities:
Derivative liabilities	0
Successor Ambac [Member] | Level 1 [Member] | Credit Derivatives [Member]
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 1 [Member] | Other Contracts [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 1 [Member] | Other Assets [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets	0	0
Derivative assets - interest rate swaps - liability position		0
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0	0
Successor Ambac [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 2 [Member]
Financial assets:
Cash	0	2,945
Loans	0	0
Other assets	0	0
Total financial assets	6,377,246	6,014,080
Financial liabilities:
Obligations under investment and repurchase agreements	0	0
Long term debt, including accrued interest	0	0
Liabilities for net financial guarantees written	0	0
Total financial liabilities	13,957,235	14,416,418
Successor Ambac [Member] | Level 2 [Member] | Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	0	0
Financial liabilities:
Long-term debt	11,870,471	12,577,148
Successor Ambac [Member] | Level 2 [Member] | Futures Contracts [Member]
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0
Successor Ambac [Member] | Level 2 [Member] | Credit Derivatives [Member]
Financial assets:
Derivative assets	0
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 2 [Member] | Other Contracts [Member]
Financial liabilities:
Derivative liabilities	137	165
Successor Ambac [Member] | Level 2 [Member] | Other Assets [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets	89,159	76,631
Derivative assets - interest rate swaps - liability position		(1,257)
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	(50,107)	(55,619)
Successor Ambac [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Financial liabilities:
Derivative liabilities	181,443	122,418
Successor Ambac [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,885,244	1,680,834
Successor Ambac [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	70,047	91,472
Successor Ambac [Member] | Level 3 [Member]
Financial assets:
Cash	0	0
Loans	6,129	6,238
Other assets	12,401	13,384
Total financial assets	15,249,463	15,961,582
Financial liabilities:
Obligations under investment and repurchase agreements	163,960	360,506
Long term debt, including accrued interest	1,741,594	1,215,029
Liabilities for net financial guarantees written	6,661,100	4,876,617
Total financial liabilities	10,072,311	8,153,691
Successor Ambac [Member] | Level 3 [Member] | Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	12,503,484	13,398,895
Financial liabilities:
Long-term debt	1,288,703	1,514,605
Successor Ambac [Member] | Level 3 [Member] | Futures Contracts [Member]
Financial assets:
Derivative assets	0	0
Financial liabilities:
Derivative liabilities	0
Successor Ambac [Member] | Level 3 [Member] | Credit Derivatives [Member]
Financial assets:
Derivative assets	1,052
Financial liabilities:
Derivative liabilities	83,882	94,322
Successor Ambac [Member] | Level 3 [Member] | Other Contracts [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 3 [Member] | Other Assets [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets	0	0
Derivative assets - interest rate swaps - liability position		0
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0	0
Successor Ambac [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Financial liabilities:
Derivative liabilities	133,072	92,612
Successor Ambac [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Successor Ambac [Member] | Municipal Bonds [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	939,442	1,377,723
Successor Ambac [Member] | Municipal Bonds [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	939,442	1,377,723
Successor Ambac [Member] | Municipal Bonds [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Municipal Bonds [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	939,442	1,377,723
Successor Ambac [Member] | Municipal Bonds [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Corporate Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,805,683	1,489,369
Successor Ambac [Member] | Corporate Obligations [Member] | Total Fair Value [Member] | Variable Interest Entity [Member]
Financial assets:
Fixed income securities	2,651,683	2,475,182
Successor Ambac [Member] | Corporate Obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,805,683	1,489,369
Successor Ambac [Member] | Corporate Obligations [Member] | Carrying Amount [Member] | Variable Interest Entity [Member]
Financial assets:
Fixed income securities	2,651,683	2,475,182
Successor Ambac [Member] | Corporate Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Corporate Obligations [Member] | Level 1 [Member] | Variable Interest Entity [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Corporate Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,801,938	1,485,867
Successor Ambac [Member] | Corporate Obligations [Member] | Level 2 [Member] | Variable Interest Entity [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Corporate Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	3,745	3,502
Successor Ambac [Member] | Corporate Obligations [Member] | Level 3 [Member] | Variable Interest Entity [Member]
Financial assets:
Fixed income securities	2,651,683	2,475,182
Successor Ambac [Member] | Foreign Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	125,113	124,877
Successor Ambac [Member] | Foreign Obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	125,113	124,877
Successor Ambac [Member] | Foreign Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Foreign Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	125,113	124,877
Successor Ambac [Member] | Foreign Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | US Government Debt Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	78,048	126,248
Fixed income securities, pledged as collateral	64,031	126,223
Successor Ambac [Member] | US Government Debt Securities [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	78,048	126,248
Fixed income securities, pledged as collateral	64,031	126,223
Successor Ambac [Member] | US Government Debt Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	78,048	126,248
Fixed income securities, pledged as collateral	64,031	126,223
Successor Ambac [Member] | US Government Debt Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
Successor Ambac [Member] | US Government Debt Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	29,868	32,154
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	29,868	32,154
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	29,868	31,946
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	208
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,824,492	1,558,625
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,824,492	1,558,625
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,824,492	1,558,625
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	46,040	183,872
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	46,040	183,872
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	46,040	183,872
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Asset-backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,307,542	992,448
Successor Ambac [Member] | Asset-backed Securities [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,307,542	992,448
Successor Ambac [Member] | Asset-backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Successor Ambac [Member] | Asset-backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,248,627	928,375
Successor Ambac [Member] | Asset-backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	58,915	64,073
Successor Ambac [Member] | Short-term Investments [Member] | Total Fair Value [Member]
Financial assets:
Short term investments	550,900	271,119
Successor Ambac [Member] | Short-term Investments [Member] | Carrying Amount [Member]
Financial assets:
Short term investments	550,900	271,119
Successor Ambac [Member] | Short-term Investments [Member] | Level 1 [Member]
Financial assets:
Short term investments	549,124	267,612
Successor Ambac [Member] | Short-term Investments [Member] | Level 2 [Member]
Financial assets:
Short term investments	1,776	3,507
Successor Ambac [Member] | Short-term Investments [Member] | Level 3 [Member]
Financial assets:
Short term investments	0	0
Successor Ambac [Member] | Other [Member] | Total Fair Value [Member]
Financial assets:
Other investments	282,845	241,069
Successor Ambac [Member] | Other [Member] | Carrying Amount [Member]
Financial assets:
Other investments	290,870	241,069
Successor Ambac [Member] | Other [Member] | Level 1 [Member]
Financial assets:
Other investments	0	0
Successor Ambac [Member] | Other [Member] | Level 2 [Member]
Financial assets:
Other investments	270,791	240,969
Successor Ambac [Member] | Other [Member] | Level 3 [Member]
Financial assets:
Other investments	$ 12,054	$ 100

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Guaranteed investment agreements at fair value.

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Fair value of restricted cash and cash equivalents.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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Carrying value as of the balance sheet date of the sum of the obligations to contract holders to provide to them an agreed upon rate of return pursuant to the terms of the underlying contract. These contracts represent lending by the contract holders to the entity in return for a guaranteed (primarily fixed) interest rate until maturity, unless called earlier if the contracts provide that option to the contract holders (usually institutions). There is little or no insurance risk for the entity.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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