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Schedule I - Consolidated Summary of Investments Other Than Investments in Related Parties (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost $ 9,241,686
Fair value 8,919,749
Amount at which shown in the Balance Sheet 8,920,788
United States Government, Government Agencies and Authorities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 305,336
Fair value 301,926
Amount at which shown in the Balance Sheet 301,926
States, municipalities and political subdivisions  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 747,872
Fair value 762,465
Amount at which shown in the Balance Sheet 762,465
Foreign government  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 22,476
Fair value 19,977
Amount at which shown in the Balance Sheet 19,977
All other corporate bonds  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 5,830,098
Fair value 5,524,406
Amount at which shown in the Balance Sheet 5,524,406
Residential mortgage-backed securities ("RMBS")  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 83,965
Fair value 87,688
Amount at which shown in the Balance Sheet 87,688
Commercial mortgage-backed securities ("CMBS")  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 307,430
Fair value 300,967
Amount at which shown in the Balance Sheet 300,967
Asset-backed securities ("ABS")  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 404,935
Fair value 392,045
Amount at which shown in the Balance Sheet 392,045
Fixed income securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 7,922,300
Fair value 7,611,953
Amount at which shown in the Balance Sheet 7,611,953
Policy Loans  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 176,782
Fair value 176,782
Amount at which shown in the Balance Sheet 176,782
Derivatives  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 13,527
Fair value 2,976
Amount at which shown in the Balance Sheet 2,976
Short-term investments  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 269,016
Fair value 269,016
Amount at which shown in the Balance Sheet 269,016
Other securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 1,319,386
Fair value 1,307,796
Amount at which shown in the Balance Sheet 1,308,835
Commercial Mortgage Loan  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 853,073
Fair value 852,034
Amount at which shown in the Balance Sheet 853,073
Redeemable Preferred Stock  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 14,800
Fair value 14,800
Amount at which shown in the Balance Sheet 14,800
Fixed maturities, available for sale  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 7,716,912
Fair value 7,404,274
Amount at which shown in the Balance Sheet 7,404,274
Trading Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 194,785
Fair value 197,651
Amount at which shown in the Balance Sheet 197,651
Common Stock  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 6,988
Fair value 6,988
Amount at which shown in the Balance Sheet 6,988
Fair value option securities  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Amortized cost 10,603
Fair value 10,028
Amount at which shown in the Balance Sheet $ 10,028