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Summary of Amortized Cost and Estimated Fair Value Through Fixed Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, Amortized Cost	$ 43,213
Due in one year through five years, Amortized Cost	218,132
Due in five years through ten years, Amortized Cost	242,488
Due in ten years through fifteen years, Amortized Cost	27,757
Due after fifteen years, Amortized Cost	65,300
Fixed maturities, Amortized Cost	1,260,439	$ 1,231,568
Due in one year or less, Estimated Fair value	43,642
Due in one year through five years, Estimated Fair value	228,538
Due in five years through ten years, Estimated Fair value	252,950
Due in ten years through fifteen years, Estimated Fair value	29,337
Due after fifteen years, Estimated Fair value	70,163
Fixed Maturities, estimated fair value	1,303,775	1,253,159
Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	393,325
Fixed maturities, Amortized Cost	393,325	325,448
Estimated Fair value	401,084
Fixed Maturities, estimated fair value	401,084	328,374
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	137,953
Fixed maturities, Amortized Cost	137,953	168,020
Estimated Fair value	139,150
Fixed Maturities, estimated fair value	139,150	168,537
Commercial Mortgage-Backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	132,271
Fixed maturities, Amortized Cost	132,271	183,944
Estimated Fair value	138,911
Fixed Maturities, estimated fair value	$ 138,911	$ 188,104

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