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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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