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Fair Value Measurements - Summary of Carrying Amounts and Corresponding Fair Values for Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities—held-to-maturity $ 609,281 $ 621,343
Fixed maturity securities—available-for-sale 416,240 441,146
Equity securities 33,480 27,903
Short-term investments 72,849 56,548
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities—held-to-maturity 576,191 599,421
Fixed maturity securities—available-for-sale 416,240 441,146
Equity securities 33,480 27,903
Short-term investments 72,849 56,548
Cash and cash equivalents 110,281 43,813
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed maturity securities—held-to-maturity 609,281 621,343
Fixed maturity securities—available-for-sale 416,240 441,146
Equity securities 33,480 27,903
Short-term investments 72,849 56,548
Cash and cash equivalents $ 110,281 $ 43,813