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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, 2018
Dec. 31, 2017
Bottom of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Investment properties capitalization rates 2.75% 3.50%
Investment properties terminal capitalization rates 3.65% 4.00%
Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Investment properties capitalization rates 8.75% 9.00%
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 8.95% 9.20%
Power and infrastructure [Member] | Top of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 16.50% 16.50%
Timberland Investment [Member] | Bottom of range [Member]    
Disclosure of fair value measurement of assets [Line Items]    
Other invested assets fair value discount rate 5.00% 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% 7.50%