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Segregated Funds - Summary of Composition of Net Assets by Categories of Segregated Funds (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Bottom of range [Member] | Money market funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 2.00% | 2.00%
Bottom of range [Member] | Fixed income funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 14.00% | 14.00%
Bottom of range [Member] | Balanced funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 25.00% | 22.00%
Bottom of range [Member] | Equity funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 58.00% | 55.00%
Top of range [Member] | Money market funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 3.00% | 3.00%
Top of range [Member] | Fixed income funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 15.00% | 15.00%
Top of range [Member] | Balanced funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 26.00% | 29.00%
Top of range [Member] | Equity funds [Member] |  |
Disclosure of composition of net assets by categories of segregated funds [line items] |  |
Type of fund | 60.00% | 60.00%

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