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

Income Taxes - Summary of Reconciliation Between Income Taxes Computed at the U.S. Statutory Income Tax Rate (Detail) (Parenthetical)

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Income Taxes - Summary of Reconciliation Between Income Taxes Computed at the U.S. Statutory Income Tax Rate (Detail) (Parenthetical)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Benefit for income taxes rate 21.00% 21.00%