|
Fair Value Measurement of Financial Assets and Financial Liabilities on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
|
Sep. 30, 2012
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
$ 2,052,226 |
| Fair Value of liabilities |
297,819 |
|
U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
48,341 |
|
U.S. government agencies
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
46,305 |
|
Municipal bonds
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
265,011 |
|
Commercial mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
10,209 |
|
Agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
332,027 |
|
Non-agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
6,759 |
|
Equity securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
18,318 |
|
Short term investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
485 |
|
Other investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
14,324 |
|
Life settlement contracts
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
171,476 |
|
Equity securities sold but not yet purchased, market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
43 |
|
Fixed maturity securities sold but not yet purchased , market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
57,155 |
|
Securities sold under agreements to repurchase, at contract value
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
226,098 |
|
Life settlement contract profit commission
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
9,550 |
|
Derivatives
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
4,973 |
|
Corporate Bonds | Finance
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
773,474 |
|
Corporate Bonds | Industrial
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
330,269 |
|
Corporate Bonds | Utilities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
35,228 |
|
Fair Value, Inputs, Level 1
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
67,144 |
| Fair Value of liabilities |
57,198 |
|
Fair Value, Inputs, Level 1 | U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
48,341 |
|
Fair Value, Inputs, Level 1 | U.S. government agencies
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Municipal bonds
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Finance
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Industrial
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Utilities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Commercial mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Non-agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Equity securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
18,318 |
|
Fair Value, Inputs, Level 1 | Short term investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
485 |
|
Fair Value, Inputs, Level 1 | Other investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Life settlement contracts
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 1 | Equity securities sold but not yet purchased, market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
43 |
|
Fair Value, Inputs, Level 1 | Fixed maturity securities sold but not yet purchased , market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
57,155 |
|
Fair Value, Inputs, Level 1 | Securities sold under agreements to repurchase, at contract value
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 1 | Life settlement contract profit commission
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 1 | Derivatives
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 2
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
1,799,282 |
| Fair Value of liabilities |
231,071 |
|
Fair Value, Inputs, Level 2 | U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 2 | U.S. government agencies
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
46,305 |
|
Fair Value, Inputs, Level 2 | Municipal bonds
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
265,011 |
|
Fair Value, Inputs, Level 2 | Commercial mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
10,209 |
|
Fair Value, Inputs, Level 2 | Agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
332,027 |
|
Fair Value, Inputs, Level 2 | Non-agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
6,759 |
|
Fair Value, Inputs, Level 2 | Equity securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 2 | Short term investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 2 | Other investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 2 | Life settlement contracts
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 2 | Equity securities sold but not yet purchased, market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 2 | Securities sold under agreements to repurchase, at contract value
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
226,098 |
|
Fair Value, Inputs, Level 2 | Life settlement contract profit commission
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 2 | Derivatives
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
4,973 |
|
Fair Value, Inputs, Level 2 | Corporate Bonds | Finance
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
773,474 |
|
Fair Value, Inputs, Level 2 | Corporate Bonds | Industrial
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
330,269 |
|
Fair Value, Inputs, Level 2 | Corporate Bonds | Utilities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
35,228 |
|
Fair Value, Inputs, Level 3
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
185,800 |
| Fair Value of liabilities |
9,550 |
|
Fair Value, Inputs, Level 3 | U.S. treasury securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | U.S. government agencies
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Municipal bonds
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Finance
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Industrial
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Utilities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Commercial mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Non-agency, residential mortgage backed securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Equity securities
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Short term investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
0 |
|
Fair Value, Inputs, Level 3 | Other investments
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
14,324 |
|
Fair Value, Inputs, Level 3 | Life settlement contracts
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair value of assets |
171,476 |
|
Fair Value, Inputs, Level 3 | Equity securities sold but not yet purchased, market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 3 | Fixed maturity securities sold but not yet purchased , market
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 3 | Securities sold under agreements to repurchase, at contract value
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
0 |
|
Fair Value, Inputs, Level 3 | Life settlement contract profit commission
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
9,550 |
|
Fair Value, Inputs, Level 3 | Derivatives
|
|
| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
|
| Fair Value of liabilities |
$ 0 |