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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($) | Mar. 31, 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 $2,480,532 and $3,020,744) | $ 3,611,947,000 |
Financial assets: |  |
Short term investments | 908,235,000 | $ 430,331,000
Other investments | 428,556,000 | 391,217,000
Derivative assets | 76,789,000 | 59,768,000
Other assets | 4,148,000 | 4,516,000
Long-term Debt | 2,929,227,000 | 2,928,929,000
Financial liabilities: |  |
Derivative liabilities | 86,923,000 | 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 $2,480,532 and $3,020,744) | 3,128,995,000 | 2,737,286,000
Financial assets: |  |
Loans | 4,375,761,000 | 4,287,664,000
Derivative assets | 59,228,000 | 66,302,000
Long-term Debt | 5,737,263,000 | 5,268,596,000
Financial liabilities: |  |
Derivative liabilities | 1,781,903,000 | 1,712,062,000
Long-term debt | 5,401,992,000 | 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 $2,480,532 and $3,020,744) | 908,235,000 | 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 $2,480,532 and $3,020,744) | 2,858,404,000 | 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 $2,480,532 and $3,020,744) | 270,591,000 | 0
Total Fair Value [Member] |  |
Financial assets: |  |
Cash | 21,840,000 | 82,494,000
Reported Value Measurement [Member] |  |
Financial assets: |  |
Cash | 21,840,000 | 82,494,000
Loans | 10,124,000 | 9,913,000
Other assets | 4,148,000 | 4,516,000
Total financial assets | 11,720,253,000 | 11,185,865,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | (839,056,000) | (718,388,000)
Long-term debt | 3,320,562,000 | 3,304,737,000
Total financial liabilities | 10,087,206,000 | 9,643,706,000
Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 3,254,000 | 999,000
Loans | 4,375,761,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 5,737,263,000 | 5,268,596,000
Reported Value Measurement [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 908,235,000 | 430,331,000
Reported Value Measurement [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 428,556,000 | 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 $2,480,532 and $3,020,744) | 2,858,404,000 | 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 $2,480,532 and $3,020,744) | 270,591,000 |
Reported Value Measurement [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 3,182,000 |
Financial liabilities: |  |
Derivative liabilities | 0 | 3,379,000
Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 85,457,000 | 71,861,000
Reported Value Measurement [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,781,903,000 | 1,712,062,000
Reported Value Measurement [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,077,000 | 1,459,000
Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 73,218,000 | 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 | 59,228,000 | 66,302,000
Level 1 [Member] |  |
Financial assets: |  |
Cash | 15,891,000 | 52,661,000
Total financial assets | 1,203,358,000 | 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 | 3,254,000 | 999,000
Loans | 0 | 0
Financial liabilities: |  |
Long-term debt | 0 | 0
Level 1 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 864,065,000 | 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 | 102,257,000 | 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 $2,480,532 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 $2,480,532 and $3,020,744) | 0 |
Level 1 [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 3,182,000 |
Financial liabilities: |  |
Derivative liabilities | 0 | 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 | 5,949,000 | 29,833,000
Total financial assets | 2,816,193,000 | 3,152,882,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 0 | 0
Long-term debt | 2,942,229,000 | 2,909,272,000
Total financial liabilities | 10,370,724,000 | 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 | 5,561,135,000 | 5,051,504,000
Level 2 [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 44,170,000 | 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 $2,480,532 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 $2,480,532 and $3,020,744) | 270,591,000 |
Level 2 [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 0 |
Financial liabilities: |  |
Derivative liabilities | 0 | 0
Level 2 [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position |  |
Derivative liabilities | 85,457,000 | 71,861,000
Level 2 [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,781,903,000 | 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 | 19,107,000 | 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 | 59,228,000 | 66,302,000
Level 3 [Member] |  |
Financial assets: |  |
Cash | 0 | 0
Total financial assets | 7,394,196,000 | 7,176,883,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 509,830,000 | 558,824,000
Long-term debt | 382,084,000 | 350,694,000
Total financial liabilities | 1,117,438,000 | 1,128,069,000
Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Loans | 4,375,761,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 224,447,000 | 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 | 4,148,000 | 4,516,000
Level 3 [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 12,187,000 | 11,620,000
Level 3 [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 17,730,000 | 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 $2,480,532 and $3,020,744) | 2,858,404,000 | 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 $2,480,532 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 | 1,077,000 | 1,459,000
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 54,111,000 | 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 $2,480,532 and $3,020,744) | 424,884,000 | 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 $2,480,532 and $3,020,744) | 1,233,544,000 | 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 $2,480,532 and $3,020,744) | 31,292,000 | 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 $2,480,532 and $3,020,744) | 100,429,000 | 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 $2,480,532 and $3,020,744) | 256,285,000 | 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 $2,480,532 and $3,020,744) | 132,977,000 | 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 $2,480,532 and $3,020,744) | 440,400,000 | 442,443,000
Fair Value, Measurements, Recurring [Member] |  |
Financial assets: |  |
Total financial assets | 11,698,535,000 | 11,163,670,000
Financial liabilities: |  |
Liabilities for net financial guarantees written | 509,830,000 | 558,824,000
Long-term debt | 3,324,313,000 | 3,259,966,000
Total financial liabilities | 11,488,162,000 | 10,876,147,000
Fair Value, Measurements, Recurring [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Restricted Cash and Cash Equivalents, Current | 3,254,000 | 999,000
Loans | 4,375,761,000 | 4,287,664,000
Financial liabilities: |  |
Long-term debt | 5,785,582,000 | 5,268,596,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] |  |
Financial assets: |  |
Short term investments | 908,235,000 | 430,331,000
Fair Value, Measurements, Recurring [Member] | Equity Method Investments [Member] |  |
Financial assets: |  |
Other assets | 4,148,000 | 4,516,000
Fair Value, Measurements, Recurring [Member] | Loans Receivable [Member] |  |
Financial assets: |  |
Loans | 12,187,000 | 11,620,000
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member] |  |
Financial assets: |  |
Other investments | 404,775,000 | 367,315,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 440,400,000 | 442,443,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 132,977,000 | 131,356,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 256,285,000 | 258,607,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 100,429,000 | 94,394,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 31,292,000 | 30,834,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 1,233,544,000 | 1,278,122,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 2,858,404,000 | 2,737,286,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 424,884,000 | 879,919,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 270,591,000 |
Fair Value, Measurements, Recurring [Member] | Future [Member] |  |
Financial assets: |  |
Derivative assets | 3,182,000 |
Financial liabilities: |  |
Derivative liabilities | 0 | 3,379,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Financial liabilities: |  |
Derivative liabilities - interest rate swaps - asset position | 0 |
Derivative liabilities | 85,457,000 | 71,861,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,781,903,000 | 1,712,062,000
Fair Value, Measurements, Recurring [Member] | Other Credit Derivatives [Member] |  |
Financial liabilities: |  |
Derivative liabilities | 1,077,000 | 1,459,000
Fair Value, Measurements, Recurring [Member] | Other Assets [Member] | Interest Rate Swap [Member] |  |
Financial assets: |  |
Derivative assets | 73,218,000 | 59,468,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Financial assets: |  |
Derivative assets | 59,228,000 | 66,302,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 100,429,000 | 94,394,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 30,379,000 | 29,922,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 368,545,000 | 370,372,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 132,977,000 | 131,356,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 256,285,000 | 258,607,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 913,000 | 912,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 1,233,544,000 | 1,278,122,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 424,884,000 | 879,919,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 71,855,000 | 72,071,000
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, 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 $2,480,532 and $3,020,744) | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
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