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Fair Value Measurement of Financial Assets and Financial Liabilities on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
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Jun. 30, 2012
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
$ 2,050,918 |
| Fair Value of liabilities |
304,834 |
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U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
46,863 |
|
U.S. government agencies
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
54,381 |
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Municipal bonds
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
273,052 |
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Commercial mortgage backed securities
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
10,118 |
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Agency, residential mortgage backed securities
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
367,430 |
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Non-agency, residential mortgage backed securities
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
7,224 |
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Equity securities
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
25,830 |
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Short term investments
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
33,134 |
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Other investments
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
15,103 |
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Life settlement contracts
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
151,092 |
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Equity securities sold but not yet purchased, market
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
58 |
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Fixed maturity securities sold but not yet purchased , market
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
56,920 |
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Securities sold under agreements to repurchase, at contract value
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
231,919 |
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Life settlement contract profit commission
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
11,465 |
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Derivatives
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
4,472 |
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Corporate Bonds | Finance
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
754,629 |
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Corporate Bonds | Industrial
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
272,761 |
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Corporate Bonds | Utilities
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
39,301 |
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Fair Value, Inputs, Level 1
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
105,827 |
| Fair Value of liabilities |
58 |
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Fair Value, Inputs, Level 1 | U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
46,863 |
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Fair Value, Inputs, Level 1 | Equity securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
25,830 |
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Fair Value, Inputs, Level 1 | Short term investments
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
33,134 |
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Fair Value, Inputs, Level 1 | Equity securities sold but not yet purchased, market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
58 |
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Fair Value, Inputs, Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
1,778,896 |
| Fair Value of liabilities |
288,839 |
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Fair Value, Inputs, Level 2 | U.S. government agencies
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
54,381 |
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Fair Value, Inputs, Level 2 | Municipal bonds
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
273,052 |
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Fair Value, Inputs, Level 2 | Commercial mortgage backed securities
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
10,118 |
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Fair Value, Inputs, Level 2 | Agency, residential mortgage backed securities
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|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
367,430 |
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Fair Value, Inputs, Level 2 | Non-agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
7,224 |
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Fair Value, Inputs, Level 2 | Fixed maturity securities sold but not yet purchased , market
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
56,920 |
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Fair Value, Inputs, Level 2 | Securities sold under agreements to repurchase, at contract value
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
231,919 |
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Fair Value, Inputs, Level 2 | Corporate Bonds | Finance
|
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
754,629 |
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Fair Value, Inputs, Level 2 | Corporate Bonds | Industrial
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
272,761 |
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Fair Value, Inputs, Level 2 | Corporate Bonds | Utilities
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|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
39,301 |
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Fair Value, Inputs, Level 3
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
166,195 |
| Fair Value of liabilities |
15,937 |
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Fair Value, Inputs, Level 3 | Other investments
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
15,103 |
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Fair Value, Inputs, Level 3 | Life settlement contracts
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair value of assets |
151,092 |
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Fair Value, Inputs, Level 3 | Life settlement contract profit commission
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|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
11,465 |
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Fair Value, Inputs, Level 3 | Derivatives
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
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| Fair Value of liabilities |
$ 4,472 |