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Financial Risks - Schedule of Interest Rate Risk (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
3-month US LIBOR [member] |  |  |  |  |
Disclosure of interest rates [line items] |  |  |  |  |
Interest rate | 1.91% | 2.81% | 1.69% | 1.00% | 0.61%
3-month EURIBOR [member] |  |  |  |  |
Disclosure of interest rates [line items] |  |  |  |  |
Interest rate | (0.38%) | (0.31%) | (0.33%) | (0.32%) | (0.13%)
10-year US treasury [member] |  |  |  |  |
Disclosure of interest rates [line items] |  |  |  |  |
Interest rate | 1.91% | 2.69% | 2.41% | 2.43% | 2.27%
10-year Dutch government [member] |  |  |  |  |
Disclosure of interest rates [line items] |  |  |  |  |
Interest rate | (0.06%) | 0.39% | 0.53% | 0.35% | 0.79%

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