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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	Mar. 31, 2013	Dec. 31, 2012
Financial assets:
Short term investments	$ 767,932	$ 661,658
Other investments	113,812	100
Other assets	14,230	14,557
Financial liabilities:
Obligations under investment and repurchase agreements	357,371	356,091
Liabilities subject to compromise	1,704,641	1,704,904
Long term debt, including accrued interest	153,873	150,170
Derivative liabilities	203,307	213,585
Total Fair Value [Member]
Financial assets:
Cash	53,135	43,837
Loans	7,119	7,387
Other assets	14,230	14,557
Total financial assets	23,435,256	24,345,454
Financial liabilities:
Obligations under investment and repurchase agreements	362,208	361,905
Liabilities subject to compromise	909,138	434,823
Long-term debt		801,277
Long term debt, including accrued interest	1,110,259
Liabilities for net financial guarantees written	4,576,031	3,091,257
Total financial liabilities	23,988,213	22,856,591
Carrying Amount [Member]
Financial assets:
Cash	53,135	43,837
Loans	8,691	9,203
Other assets	14,230	14,557
Total financial assets	23,445,834	24,355,930
Financial liabilities:
Obligations under investment and repurchase agreements	363,297	362,017
Liabilities subject to compromise	1,690,312
Liabilities subject to compromise		1,690,312
Long term debt, including accrued interest	399,505	377,524
Liabilities for net financial guarantees written	6,921,299	7,074,808
Total financial liabilities	26,427,157	27,693,765
Variable interest entity [Member]
Financial assets:
Fixed income securities	2,414,607	2,261,294
Loans	14,116,811	15,359,073
Financial liabilities:
Long-term debt	13,996,531	15,200,538
Long term debt, including accrued interest	14,229,373	15,436,008
Variable interest entity [Member] | Total Fair Value [Member]
Financial assets:
Restricted cash	2,258	2,290
Loans	14,318,834	15,560,051
Financial liabilities:
Long-term debt	14,207,206	15,414,233
Variable interest entity [Member] | Carrying Amount [Member]
Financial assets:
Restricted cash	2,258	2,290
Loans	14,327,840	15,568,711
Financial liabilities:
Long-term debt	14,229,373	15,436,008
Futures contracts [Member] | Total Fair Value [Member]
Financial assets:
Derivative assets		1,253
Financial liabilities:
Derivative liabilities	911
Futures contracts [Member] | Carrying Amount [Member]
Financial assets:
Derivative assets		1,253
Financial liabilities:
Derivative liabilities	911
Credit derivatives [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities	203,307	213,585
Credit derivatives [Member] | Carrying Amount [Member]
Financial liabilities:
Derivative liabilities	203,307	213,585
Other contracts [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities	215	220
Other contracts [Member] | Carrying Amount [Member]
Financial liabilities:
Derivative liabilities	215	220
Other assets [Member] | Interest rate swaps [Member] | Total Fair Value [Member]
Financial assets:
Derivative assets	112,811	124,853
Financial liabilities:
Derivative liabilities	(65,636)	(73,264)
Other assets [Member] | Interest rate swaps [Member] | Carrying Amount [Member]
Financial assets:
Derivative assets	112,811	124,853
Financial liabilities:
Derivative liabilities	(65,636)	(73,264)
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Total Fair Value [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities	366,949	390,774
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Carrying Amount [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities	366,949	390,774
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities	2,231,863	2,131,315
Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member]
Financial liabilities:
Derivative liabilities	2,231,863	2,131,315
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities	85,762	90,466
Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member] | Carrying Amount [Member]
Financial liabilities:
Derivative liabilities	85,762	90,466
Municipal obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,794,355	1,848,932
Municipal obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,794,355	1,848,932
Corporate obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,069,073	1,077,972
Corporate obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,069,073	1,077,972
Corporate obligations [Member] | Variable interest entity [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	2,414,607	2,261,294
Corporate obligations [Member] | Variable interest entity [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	2,414,607	2,261,294
Foreign obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	11,878	70,112
Foreign obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	11,878	70,112
U.S. government obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	98,312	127,283
Fixed income securities, pledged as collateral	228,228	265,779
U.S. government obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	98,312	127,283
Fixed income securities, pledged as collateral	228,228	265,779
U.S. agency obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	53,975	82,535
U.S. agency obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	53,975	82,535
Residential mortgage-backed securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,536,889	1,455,582
Residential mortgage-backed securities [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	1,536,889	1,455,582
Collateralized debt obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	27,357	33,342
Collateralized debt obligations [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	27,357	33,342
Other commercial asset-backed [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	810,451	706,637
Other commercial asset-backed [Member] | Carrying Amount [Member]
Financial assets:
Fixed income securities	810,451	706,637
Short-term [Member] | Total Fair Value [Member]
Financial assets:
Short term investments	767,932	661,658
Short-term [Member] | Carrying Amount [Member]
Financial assets:
Short term investments	767,932	661,658
Other [Member] | Total Fair Value [Member]
Financial assets:
Other investments	113,812	100
Other [Member] | Carrying Amount [Member]
Financial assets:
Other investments	113,812	100
Level 1 [Member]
Financial assets:
Cash	53,135	43,837
Total financial assets	1,147,312	1,098,328
Financial liabilities:
Total financial liabilities	911
Level 1 [Member] | Variable interest entity [Member]
Financial assets:
Restricted cash	2,258	2,290
Level 1 [Member] | Futures contracts [Member]
Financial assets:
Derivative assets		1,253
Financial liabilities:
Derivative liabilities	911
Level 1 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member]
Financial assets:
Derivative assets
Level 1 [Member] | U.S. government obligations [Member]
Financial assets:
Fixed income securities	98,312	127,283
Fixed income securities, pledged as collateral	228,228	265,779
Level 1 [Member] | Short-term [Member]
Financial assets:
Short term investments	765,379	657,886
Level 2 [Member]
Financial assets:
Total financial assets	5,677,286	5,544,313
Financial liabilities:
Liabilities subject to compromise	909,138	434,823
Total financial liabilities	15,699,526	15,323,314
Level 2 [Member] | Variable interest entity [Member]
Financial assets:
Loans	202,023	200,978
Financial liabilities:
Long-term debt	12,296,617	12,457,732
Level 2 [Member] | Futures contracts [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities
Level 2 [Member] | Other contracts [Member]
Financial liabilities:
Derivative liabilities	215	220
Level 2 [Member] | Other assets [Member] | Interest rate swaps [Member]
Financial assets:
Derivative assets	112,811	124,853
Financial liabilities:
Derivative liabilities	(65,636)	(73,264)
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities	241,567	282,022
Level 2 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member] | Variable interest entity [Member]
Financial liabilities:
Derivative liabilities	2,231,863	2,131,315
Level 2 [Member] | Interest rate swaps - liability position [Member] | Currency swaps [Member] | Variable interest entity [Member]
Financial liabilities:
Derivative liabilities	85,762	90,466
Level 2 [Member] | Municipal obligations [Member]
Financial assets:
Fixed income securities	1,794,355	1,848,932
Level 2 [Member] | Corporate obligations [Member]
Financial assets:
Fixed income securities	1,065,421	1,074,316
Level 2 [Member] | Foreign obligations [Member]
Financial assets:
Fixed income securities	11,878	70,112
Level 2 [Member] | U.S. agency obligations [Member]
Financial assets:
Fixed income securities	53,975	82,535
Level 2 [Member] | Residential mortgage-backed securities [Member]
Financial assets:
Fixed income securities	1,536,889	1,455,582
Level 2 [Member] | Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	23,452	26,860
Level 2 [Member] | Other commercial asset-backed [Member]
Financial assets:
Fixed income securities	760,217	656,373
Level 2 [Member] | Short-term [Member]
Financial assets:
Short term investments	2,553	3,772
Level 2 [Member] | Other [Member]
Financial assets:
Other investments	113,712
Level 3 [Member]
Financial assets:
Loans	7,119	7,387
Other assets	14,230	14,557
Total financial assets	16,610,658	17,702,813
Financial liabilities:
Obligations under investment and repurchase agreements	362,208	361,905
Long-term debt		801,277
Long term debt, including accrued interest	1,110,259
Liabilities for net financial guarantees written	4,576,031	3,091,257
Total financial liabilities	8,287,776	7,533,277
Level 3 [Member] | Variable interest entity [Member]
Financial assets:
Loans	14,116,811	15,359,073
Financial liabilities:
Long-term debt	1,910,589	2,956,501
Level 3 [Member] | Futures contracts [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities
Level 3 [Member] | Credit derivatives [Member]
Financial liabilities:
Derivative liabilities	203,307	213,585
Level 3 [Member] | Interest rate swaps - liability position [Member] | Interest rate swaps [Member]
Financial assets:
Derivative assets
Financial liabilities:
Derivative liabilities	125,382	108,752
Level 3 [Member] | Corporate obligations [Member]
Financial assets:
Fixed income securities	3,652	3,656
Level 3 [Member] | Corporate obligations [Member] | Variable interest entity [Member]
Financial assets:
Fixed income securities	2,414,607	2,261,294
Level 3 [Member] | Collateralized debt obligations [Member]
Financial assets:
Fixed income securities	3,905	6,482
Level 3 [Member] | Other commercial asset-backed [Member]
Financial assets:
Fixed income securities	50,234	50,264
Level 3 [Member] | Other [Member]
Financial assets:
Other investments	$ 100	$ 100

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