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Outstanding Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt |  | $ 126,253 | $ 296,640
7.75% Subordinated Notes due 2045 |  |  |
Debt Instrument [Line Items] |  |  |
Debt | [1] | 0 | 96,864
7.875% Subordinated Notes due 2047 |  |  |
Debt Instrument [Line Items] |  |  |
Debt | [2] | 126,253 | 126,147
Margin borrowing facilities |  |  |
Debt Instrument [Line Items] |  |  |
Debt | [3] | $ 0 | $ 73,629
[1] | As of December 31, 2019, the carrying value and fair value of the 7.75% Subordinated Notes due 2045 are net of unamortized debt issuance cost of $3.1 million. In August 2020, the Company redeemed all of its outstanding 7.75% subordinated notes due 2045 and unamortized debt issuance cost of $3.1 million was written off and included in the consolidated statements of operations as loss on the extinguishment of debt.
[2] | As of September 30, 2020 and December 31, 2019, the carrying value and fair value of the 7.875% Subordinated Notes due 2047 are net of unamortized debt issuance cost of $3.7 million and $3.9 million, respectively.
[3] | The Margin Borrowing Facility was fully paid down in August 2020.

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