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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, 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%

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