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Share Capital - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Jul. 31, 2020 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) | Mar. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Mar. 31, 2021 SFr / shares | Dec. 31, 2020 SFr / shares | Aug. 31, 2019 SFr / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  | 115,172,786 |  |  | 115,172,786 | 115,172,786 |  |  |
Common shares, par value | SFr / shares |  |  |  |  |  |  | SFr 0.03 | SFr 0.03 |
Proceeds from issuance of common shares |  |  |  |  | $ 214,592,000 |  |  |  |
July 2020 Offering [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  | 7,400,000 |  |  |  |  |  |
Proceeds from issuance of common shares |  |  | $ 484,800,000 |  |  |  |  |  |
Common shares price per share | $ / shares |  |  | $ 70.00 |  |  |  |  |  |
Equity issuance costs |  |  | $ 32,500,000 |  |  |  |  |  |
Sales Agreement With Jefferies LLC [Member] | 2019 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common shares, par value | SFr / shares |  |  |  |  |  |  |  |  | SFr 0.03
Common shares sold | shares |  |  |  |  |  | 2,200,000 |  |  |
Average issue price of common shares | $ / shares |  |  |  |  |  | $ 89.47 |  |  |
Proceeds from issuance of common shares |  |  |  |  |  | $ 195,500,000 |  |  |
Equity issuance costs |  |  |  |  |  | $ 4,500,000 |  |  |
Sales Agreement With Jefferies LLC [Member] | 2020 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds | $ 46,700,000 |  |  |  |  |  |  |  |
Common shares sold | shares | 300,000 |  |  |  |  | 1,800,000 |  |  |
Average issue price of common shares | $ / shares | $ 162.46 |  |  |  |  | $ 169.57 |  |  |
Proceeds from issuance of common shares |  |  |  |  |  | $ 298,000,000.0 |  |  |
Equity issuance costs | $ 700,000 |  |  |  |  | 4,500,000 |  |  |
Payments of stamp taxes related to securities |  |  |  |  | 500,000 | 4,900,000 |  |  |
Payable of stamp taxes related to securities |  | $ 4,000,000.0 |  |  |  | $ 4,000,000.0 |  |  |
Sales Agreement With Jefferies LLC [Member] | 2021 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  |  |  |  | $ 177,800,000 |  |  |  |
Common shares sold | shares |  |  |  |  | 1,100,000 |  |  |  |
Average issue price of common shares | $ / shares |  |  |  |  | $ 169.82 |  |  |  |
Equity issuance costs |  |  |  |  | $ 2,400,000 |  |  |  |
Payable of stamp taxes related to securities |  |  |  |  | $ 1,800,000 |  |  |  |
Sales Agreement With Jefferies LLC [Member] | Maximum [Member] | 2019 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  |  |  | $ 200,000,000.0 |  |  |  |  |
Sales Agreement With Jefferies LLC [Member] | Maximum [Member] | 2020 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  | $ 350,000,000.0 |  |  |  |  |  |  |
Sales Agreement With Jefferies LLC [Member] | Maximum [Member] | 2021 ATM [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds | $ 600,000,000.0 |  |  |  |  |  |  |  |

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