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Risk Management - Schedule of Risk Concentrations (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Asset classes and individual investment risks [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Income producing commercial office properties, percentage | 55.00% | 64.00%
Ontario Canada [Member] | Asset classes and individual investment risks [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Largest concentration of mortgages and real estate, percentage | 26.00% | 25.00%
A [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 41.00% | 42.00%
AA [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 17.00% | 16.00%
AAA [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 17.00% | 17.00%

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