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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
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Dec. 31, 2020 | Dec. 31, 2019
Bottom of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment properties capitalization rates | 2.75% | 2.75%
Investment properties terminal capitalization rates | 3.25% | 3.80%
Top of range [Member] |  |
Disclosure of fair value measurement of assets [Line Items] |  |
Investment properties capitalization rates | 8.50% | 8.75%
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 | 7.00% | 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 | 15.60% | 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% | 7.00%

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