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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, 2014 | Dec. 31, 2013
--- | --- | ---
Financial assets: |  |
Short term investments | $ 215,103 | $ 271,119
Other investments | 240,530 | 241,069
Other assets | 13,122 | 13,384
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 359,993 | 359,070
Long term debt, including accrued interest | 972,147 | 963,178
Derivative liabilities | 87,715 | 94,322
Variable Interest Entity [Member] |  |
Financial assets: |  |
Loans at Carrying Amount | 13,269,452 | 13,398,895
Financial liabilities: |  |
Long term debt, including accrued interest | 13,878,577 | 14,091,753
Successor Ambac [Member] |  |
Financial assets: |  |
Fixed income securities | 6,508,915 | 6,282,658
Successor Ambac [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 31,700 | 77,370
Loans | 6,402 | 6,238
Other assets | 13,122 | 13,384
Total financial assets | 22,707,346 | 22,590,005
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 362,488 | 360,506
Long term debt, including accrued interest | 1,317,986 | 1,215,029
Liabilities for net financial guarantees written | 5,683,120 | 4,876,617
Total financial liabilities | 23,387,701 | 22,570,109
Successor Ambac [Member] | Total Fair Value [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Restricted cash | 8,552 | 17,498
Loans | 13,269,452 | 13,398,895
Financial liabilities: |  |
Long-term debt | 13,878,577 | 14,091,753
Successor Ambac [Member] | Total Fair Value [Member] | Futures Contracts [Member] |  |
Financial assets: |  |
Derivative assets | 430 | 2,337
Successor Ambac [Member] | Total Fair Value [Member] | Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 87,715 | 94,322
Successor Ambac [Member] | Total Fair Value [Member] | Other Contracts [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 149 | 165
Successor Ambac [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Cash | 31,700 | 77,370
Loans at Carrying Amount | 6,250 | 6,179
Other assets | 13,122 | 13,384
Total financial assets | 22,707,194 | 22,589,946
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 359,993 | 359,070
Long term debt, including accrued interest | 1,288,483 | 1,256,602
Liabilities for net financial guarantees written | 4,339,829 | 4,509,539
Total financial liabilities | 22,012,412 | 22,243,168
Successor Ambac [Member] | Carrying Amount [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Restricted cash | 8,552 | 17,498
Loans at Carrying Amount | 13,269,452 | 13,398,895
Financial liabilities: |  |
Long-term debt | 13,878,577 | 14,091,753
Successor Ambac [Member] | Carrying Amount [Member] | Futures Contracts [Member] |  |
Financial assets: |  |
Derivative assets | 430 | 2,337
Successor Ambac [Member] | Carrying Amount [Member] | Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 87,715 | 94,322
Successor Ambac [Member] | Carrying Amount [Member] | Other Contracts [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 149 | 165
Successor Ambac [Member] | Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swaps [Member] |  |
Financial assets: |  |
Derivative assets | 83,693 | 76,631
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | (50,863) | (55,619)
Successor Ambac [Member] | Other Assets [Member] | Carrying Amount [Member] | Interest Rate Swaps [Member] |  |
Financial assets: |  |
Derivative assets | 83,693 | 76,631
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | (50,863) | (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 | (2,212) |
Financial liabilities: |  |
Derivative liabilities | 263,839 | 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 | 1,758,626 | 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 | 86,064 | 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 | (2,212) | 1,257
Financial liabilities: |  |
Derivative liabilities | 263,839 | 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 | 1,758,626 | 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 | 86,064 | 91,472
Successor Ambac [Member] | Level 1 [Member] |  |
Financial assets: |  |
Cash | 31,700 | 77,370
Loans | 0 | 0
Total financial assets | 484,249 | 617,288
Financial liabilities: |  |
Total financial liabilities | 0 |
Successor Ambac [Member] | Level 1 [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Restricted cash | 8,552 | 17,498
Successor Ambac [Member] | Level 1 [Member] | Futures Contracts [Member] |  |
Financial assets: |  |
Derivative assets | 430 | 2,337
Successor Ambac [Member] | Level 2 [Member] |  |
Financial assets: |  |
Cash | 0 | 0
Loans | 0 | 0
Total financial assets | 6,320,336 | 6,011,135
Financial liabilities: |  |
Total financial liabilities | 14,537,231 | 14,416,418
Successor Ambac [Member] | Level 2 [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Loans |  | 0
Financial liabilities: |  |
Long-term debt | 12,594,183 | 12,577,148
Successor Ambac [Member] | Level 2 [Member] | Other Contracts [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 149 | 165
Successor Ambac [Member] | Level 2 [Member] | Other Assets [Member] | Interest Rate Swaps [Member] |  |
Financial assets: |  |
Derivative assets | 83,693 | 76,631
Derivative assets - interest rate swaps - liability position |  | 1,257
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | (50,863) | (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 | (2,212) |
Financial liabilities: |  |
Derivative liabilities | 149,072 | 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 | 1,758,626 | 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 | 86,064 | 91,472
Successor Ambac [Member] | Level 3 [Member] |  |
Financial assets: |  |
Cash | 0 | 0
Loans | 6,402 | 6,238
Other assets | 13,122 | 13,384
Total financial assets | 15,902,761 | 15,961,582
Financial liabilities: |  |
Obligations under investment and repurchase agreements | 362,488 | 360,506
Long term debt, including accrued interest | 1,317,986 | 1,215,029
Liabilities for net financial guarantees written | 5,683,120 | 4,876,617
Total financial liabilities | 8,850,470 | 8,153,691
Successor Ambac [Member] | Level 3 [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Loans | 13,269,452 | 13,398,895
Financial liabilities: |  |
Long-term debt | 1,284,394 | 1,514,605
Successor Ambac [Member] | Level 3 [Member] | Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 87,715 | 94,322
Successor Ambac [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swaps [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 114,767 | 92,612
Successor Ambac [Member] | Municipal Bonds [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 1,185,288 | 1,377,723
Successor Ambac [Member] | Municipal Bonds [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,185,288 | 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 | 1,185,288 | 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 | 1,647,584 | 1,489,369
Successor Ambac [Member] | Corporate Obligations [Member] | Total Fair Value [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,546,762 | 2,475,182
Successor Ambac [Member] | Corporate Obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,647,584 | 1,489,369
Successor Ambac [Member] | Corporate Obligations [Member] | Carrying Amount [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,546,762 | 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 2 [Member] |  |
Financial assets: |  |
Fixed income securities | 1,644,028 | 1,485,867
Successor Ambac [Member] | Corporate Obligations [Member] | Level 3 [Member] |  |
Financial assets: |  |
Fixed income securities | 3,556 | 3,502
Successor Ambac [Member] | Corporate Obligations [Member] | Level 3 [Member] | Variable Interest Entity [Member] |  |
Financial assets: |  |
Fixed income securities | 2,546,762 | 2,475,182
Successor Ambac [Member] | Foreign Obligations [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Fixed income securities | 142,044 | 124,877
Successor Ambac [Member] | Foreign Obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 142,044 | 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 | 142,044 | 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 | 106,958 | 126,248
Fixed income securities, pledged as collateral | 125,123 | 126,223
Successor Ambac [Member] | US Government Debt Securities [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 106,958 | 126,248
Fixed income securities, pledged as collateral | 125,123 | 126,223
Successor Ambac [Member] | US Government Debt Securities [Member] | Level 1 [Member] |  |
Financial assets: |  |
Fixed income securities | 106,958 | 126,248
Fixed income securities, pledged as collateral | 125,123 | 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 | 31,825 | 32,154
Successor Ambac [Member] | U.S. Agency Obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 31,825 | 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 | 31,825 | 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 | 1,655,658 | 1,558,625
Successor Ambac [Member] | Residential Mortgage-Backed Securities [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,655,658 | 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 | 1,655,658 | 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 | 177,339 | 183,872
Successor Ambac [Member] | Collateralized Debt Obligations [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 177,339 | 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 | 177,339 | 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 | 1,221,993 | 992,448
Successor Ambac [Member] | Asset-backed Securities [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Fixed income securities | 1,221,993 | 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 | 1,158,626 | 928,375
Successor Ambac [Member] | Asset-backed Securities [Member] | Level 3 [Member] |  |
Financial assets: |  |
Fixed income securities | 63,367 | 64,073
Successor Ambac [Member] | Short-Term [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Short term investments | 215,103 | 271,119
Successor Ambac [Member] | Short-Term [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Short term investments | 215,103 | 271,119
Successor Ambac [Member] | Short-Term [Member] | Level 1 [Member] |  |
Financial assets: |  |
Short term investments | 211,486 | 267,612
Successor Ambac [Member] | Short-Term [Member] | Level 2 [Member] |  |
Financial assets: |  |
Short term investments | 3,617 | 3,507
Successor Ambac [Member] | Short-Term [Member] | Level 3 [Member] |  |
Financial assets: |  |
Short term investments | 0 | 0
Successor Ambac [Member] | Other [Member] | Total Fair Value [Member] |  |
Financial assets: |  |
Other investments | 240,530 | 241,069
Successor Ambac [Member] | Other [Member] | Carrying Amount [Member] |  |
Financial assets: |  |
Other investments | 240,530 | 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 | 240,430 | 240,969
Successor Ambac [Member] | Other [Member] | Level 3 [Member] |  |
Financial assets: |  |
Other investments | $ 100 | $ 100

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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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