General form of registration statement for all companies including face-amount certificate companies

Goodwill and Intangible Assets - Summary of Changes in the Carrying Amount of Goodwill (Detail)

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Goodwill and Intangible Assets - Summary of Changes in the Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Gross carrying amount $ 9,393 $ 9,393 $ 9,393
Accumulated impairment losses 0 0  
Net carrying value of goodwill $ 9,393 $ 9,393 $ 9,393