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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | $ 716,170 |  | $ 871,135 |
On Deposit With Governmental Authorities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 33,866 |  | 36,176 |
Intercompany Trusts Held For Benefit Of U.S. Policyholders |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 496,939 |  | 584,683 |
Held In Trust Pursuant To Third Party Requirements |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 100,382 |  | 129,339 |
Letter Of Credit Held For Third Party Requirements |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 5,495 |  |  |
Securities held as collateral for borrowing arrangements |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | $ 79,488 | [1] | $ 120,937 | [1]
[1] | Amount required to collateralize margin borrowing facility.

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