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Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Surplus note $ 11,029 $ 11,397
Surplus Note [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Surplus note 11,029 11,397
Surplus Note [Member] | Level 3 [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated fair value $ 9,955 $ 10,125