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Invested Assets and Investment Income - Summary of Invested Assets and Segregated Funds Net Assets, Measured at Fair Value (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Bottom of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Investment properties capitalization rates 2.25% 2.75%
Investment properties terminal capitalization rates 3.25% 3.25%
Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Investment properties capitalization rates 9.00% 8.50%
Investment properties terminal capitalization rates 9.25% 9.25%
Power and infrastructure [Member] | Bottom of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 7.25% 7.00%
Power and infrastructure [Member] | Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 20.00% 15.60%
Timberland Investment [Member] | Bottom of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 4.50% 5.00%
Timberland Investment [Member] | Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 7.00% 7.00%