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Insurance Operations - Assets Held by Insurance Regulators (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Investments    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 3,484 $ 3,550
Restricted cash and cash equivalents    
Statutory Accounting Practices [Line Items]    
Assets held by insurance regulators $ 2,635 $ 2,635