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Share Capital - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Jul. 31, 2020 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2019 USD ($) shares | Sep. 30, 2020 SFr / shares | Dec. 31, 2019 SFr / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  | 115,172,786 |  | 115,172,786 |  |  |  | 103,901,006
Common shares, par value | SFr / shares |  |  |  |  |  |  |  |  | SFr 0.03 | SFr 0.03
Net cash proceeds from sale of common shares |  |  |  |  |  | $ 582,225,000 | $ 121,216,000 |  |  |
July 2020 Offering [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares sold | shares | 7,400,000 |  |  |  |  |  |  |  |  |
Net cash proceeds from sale of common shares | $ 484,800,000 |  |  |  |  |  |  |  |  |
Common shares price per share | $ / shares | $ 70.00 |  |  |  |  |  |  |  |  |
Equity issuance costs and stamp tax | $ 32,500,000 |  |  |  |  |  |  |  |  |
Accrued equity issuance costs and stamp taxes |  |  |  | $ 4,900,000 |  | $ 4,900,000 |  |  |  |
Maximum [Member] | 2019 ATM [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  | $ 200,000,000.0 |  |  |  |  |  |  |  |
Sales Agreement With Jefferies LLC [Member] | 2018 ATM [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  |  |  | 1,500,000 |  | 2,800,000 | 2,800,000 |  |
Net cash proceeds from sale of common shares |  |  |  |  | $ 69,400,000 |  | $ 121,900,000 | $ 120,600,000 |  |
Issuance costs |  |  |  |  | 1,500,000 |  | 3,100,000 |  |  |
Equity issuance costs |  |  |  |  |  |  |  | $ 4,400,000 |  |
Payments of stamp taxes related to securities |  |  |  |  | 500,000 |  | 700,000 |  |  |
Accrued stamp taxes |  |  |  |  | $ 600,000 |  | $ 600,000 |  |  |
Sales Agreement With Jefferies LLC [Member] | 2019 ATM [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  |  | 100,000 |  | 1,300,000 |  |  |  |
Net cash proceeds from sale of common shares |  |  |  | $ 9,600,000 |  | $ 91,900,000 |  |  |  |
Issuance costs |  |  |  | 200,000 |  | 2,400,000 |  |  |  |
Payments of stamp taxes related to securities |  |  |  | 400,000 |  | 400,000 |  |  |  |
Accrued stamp taxes |  |  |  | $ 600,000 |  | $ 600,000 |  |  |  |
Sales Agreement With Jefferies LLC [Member] | Maximum [Member] | 2018 ATM [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  |  | $ 125,000,000.0 |  |  |  |  |  |  |

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