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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | $ 3,460,894,000 |
Financial assets: |  |
Short term investments | 772,299,000 | $ 430,331,000
Other investments | 469,438,000 | 391,217,000
Derivative assets | 72,615,000 | 59,768,000
Other assets | 3,771,000 | 4,516,000
Long-term Debt | 2,946,620,000 | 2,928,929,000
Financial liabilities: |  |
Derivative liabilities | 88,484,000 | 76,999,000
Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 3,138,714,000 | 2,737,286,000
Financial assets: |  |
Loans | 4,288,572,000 | 4,287,664,000
Derivative assets | 62,941,000 | 66,302,000
Long-term Debt | 5,648,083,000 | 5,268,596,000
Financial liabilities: |  |
Derivative liabilities | 1,818,273,000 | 1,712,062,000
Long-term debt | 5,308,724,000 | 5,268,596,000
Short-term Investments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 772,299,000 | 430,331,000
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889,000 | 2,737,286,000
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825,000 | 0
Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 17,514,000 | 82,494,000
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash | 17,514,000 | 82,494,000
Loans | 9,760,000 | 9,913,000
Other assets | 3,771,000 | 4,516,000
Total financial assets | 11,552,480,000 | 11,185,865,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | (861,263,000) | (718,388,000)
Long-term debt | 3,353,716,000 | 3,304,737,000
Total financial liabilities | 10,047,054,000 | 9,643,706,000
Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 28,500,000 | 999,000
Loans | 4,288,572,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 5,648,083,000 | 5,268,596,000
Reported Value Measurement [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 772,299,000 | 430,331,000
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 469,438,000 | 391,217,000
Reported Value Measurement [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889,000 | 2,737,286,000
Reported Value Measurement [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825,000 |
Reported Value Measurement [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 220,000 |
Financial liabilities: |  |
Derivative liabilities |  | 3,379,000
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 239,000 |
Derivative liabilities | 87,623,000 | 71,861,000
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,818,273,000 | 1,712,062,000
Reported Value Measurement [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 861,000 | 1,459,000
Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 72,156,000 | 59,468,000
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62,941,000 | 66,302,000
Level 1 [Member] |  |
Financial assets: |  |
Cash | 12,028,000 | 52,661,000
Total financial assets | 1,121,747,000 | 553,964,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 0 | 0
Long-term debt | 0 | 0
Total financial liabilities | 0 | 3,379,000
Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 28,500,000 | 999,000
Loans | 0 | 0
Financial liabilities: |  |
Long-term debt | 0 | 0
Level 1 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 739,762,000 | 304,880,000
Level 1 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 0 | 0
Level 1 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 0 | 0
Level 1 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 129,689,000 | 71,108,000
Level 1 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Level 1 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 |
Level 1 [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 220,000 |
Financial liabilities: |  |
Derivative liabilities |  | 3,379,000
Level 1 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 0 | 0
Level 1 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Level 2 [Member] |  |
Financial assets: |  |
Cash | 5,486,000 | 29,833,000
Total financial assets | 2,769,543,000 | 3,152,882,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 0 | 0
Long-term debt | 2,960,079,000 | 2,909,272,000
Total financial liabilities | 10,337,250,000 | 9,744,699,000
Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Loans | 0 | 0
Financial liabilities: |  |
Long-term debt | 5,471,514,000 | 5,051,504,000
Level 2 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 32,537,000 | 125,451,000
Level 2 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 0 | 0
Level 2 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 0 | 0
Level 2 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 0 | 0
Level 2 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Level 2 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825,000 |
Level 2 [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 0 |
Financial liabilities: |  |
Derivative liabilities |  | 0
Level 2 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 239,000 |
Derivative liabilities | 87,623,000 | 71,861,000
Level 2 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,818,273,000 | 1,712,062,000
Level 2 [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 9,025,000 | 12,008,000
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62,941,000 | 66,302,000
Level 3 [Member] |  |
Financial assets: |  |
Cash | 0 | 0
Total financial assets | 7,341,142,000 | 7,176,883,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 319,384,000 | 558,824,000
Long-term debt | 388,183,000 | 350,694,000
Total financial liabilities | 939,043,000 | 1,128,069,000
Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Loans | 4,288,572,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 230,615,000 | 217,092,000
Level 3 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 0 | 0
Level 3 [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 3,771,000 | 4,516,000
Level 3 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 12,233,000 | 11,620,000
Level 3 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 17,228,000 | 16,266,000
Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889,000 | 2,737,286,000
Level 3 [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 |
Level 3 [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 0 |
Financial liabilities: |  |
Derivative liabilities |  |
Level 3 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 0 | 0
Level 3 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 3 [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 861,000 | 1,459,000
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 63,131,000 | 47,460,000
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 0 | 0
Municipal Bonds [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 342,673,000 | 879,919,000
Corporate Debt Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 1,400,659,000 | 1,278,122,000
Debt Security, Government, Non-US [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 30,743,000 | 30,834,000
US Government Debt Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 96,806,000 | 94,394,000
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 252,260,000 | 258,607,000
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 136,153,000 | 131,356,000
Asset-backed Securities [Member] | Reported Value Measurement [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 344,883,000 | 442,443,000
Fair Value, Recurring [Member] |  |
Financial assets: |  |
Total financial assets | 11,529,306,000 | 11,163,670,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 319,384,000 | 558,824,000
Long-term debt | 3,348,262,000 | 3,259,966,000
Total financial liabilities | 11,276,293,000 | 10,876,147,000
Fair Value, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 28,500,000 | 999,000
Loans | 4,288,572,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 5,702,129,000 | 5,268,596,000
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 772,299,000 | 430,331,000
Fair Value, Recurring [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 3,771,000 | 4,516,000
Fair Value, Recurring [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 12,233,000 | 11,620,000
Fair Value, Recurring [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 443,791,000 | 367,315,000
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 344,883,000 | 442,443,000
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 136,153,000 | 131,356,000
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 252,260,000 | 258,607,000
Fair Value, Recurring [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 96,806,000 | 94,394,000
Fair Value, Recurring [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 30,743,000 | 30,834,000
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 1,400,659,000 | 1,278,122,000
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889,000 | 2,737,286,000
Fair Value, Recurring [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 342,673,000 | 879,919,000
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825,000 |
Fair Value, Recurring [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 220,000 |
Financial liabilities: |  |
Derivative liabilities |  | 3,379,000
Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 239,000 |
Derivative liabilities | 87,623,000 | 71,861,000
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,818,273,000 | 1,712,062,000
Fair Value, Recurring [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 861,000 | 1,459,000
Fair Value, Recurring [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 72,156,000 | 59,468,000
Fair Value, Recurring [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 62,941,000 | 66,302,000
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 96,806,000 | 94,394,000
Fair Value, Recurring [Member] | Level 1 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 30,324,000 | 29,922,000
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 270,565,000 | 370,372,000
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 136,153,000 | 131,356,000
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 252,260,000 | 258,607,000
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 2 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 419,000 | 912,000
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 1,400,659,000 | 1,278,122,000
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 342,673,000 | 879,919,000
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 74,318,000 | 72,071,000
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] | Debt Security, Government, Non-US [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
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