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Amounts Recorded for Margin Borrowing Facilities and Subordinated Notes (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Net Carrying Amount $ 126,253 $ 296,640
7.75% Subordinated Notes due 2045    
Debt Instrument [Line Items]    
Outstanding Principal   100,000
Unamortized Debt Issuance Costs   (3,136)
Net Carrying Amount [1] 0 96,864
7.875% Subordinated Notes due 2047    
Debt Instrument [Line Items]    
Outstanding Principal 130,000 130,000
Unamortized Debt Issuance Costs (3,747) (3,853)
Net Carrying Amount [2] 126,253 126,147
Subordinated Debt    
Debt Instrument [Line Items]    
Outstanding Principal 130,000 230,000
Unamortized Debt Issuance Costs (3,747) (6,989)
Net Carrying Amount $ 126,253 $ 223,011
[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.