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Share Capital - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |
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Jan. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) $ / shares shares | Nov. 30, 2019 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2021 SFr / shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 SFr / shares | Dec. 31, 2020 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | shares |  |  |  |  |  |  |  |  |  |  | 145,364,335 |  | 115,172,786
Common shares, par value | SFr / shares |  |  |  |  |  |  |  |  |  | SFr 0.03 |  | SFr 0.03 |
Capital reserved for future issuance | shares |  |  |  |  |  |  |  |  |  |  | 5,038,262 |  |
Proceeds from issuance of common shares |  |  |  |  |  |  | $ 213,267,000 | $ 982,289,000 | $ 415,019,000 |  |  |  |
Common Stock, Voting Rights |  |  |  |  |  |  | one vote for each common share |  |  |  |  |  |
Dividends declared and paid |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  | 7,400,000 | 4,900,000 |  |  |  |  |  |  |  |  |
Common shares price per share | $ / shares |  |  | $ 70.00 | $ 64.50 |  |  |  |  |  |  |  |  |
Proceeds from issuance of common shares |  |  | $ 484,800,000 | $ 297,400,000 |  |  |  |  |  |  |  |  |
Equity issuance costs |  |  | $ 32,500,000 | $ 17,800,000 |  |  |  |  |  |  |  |  |
Payments of stamp taxes related to securities |  |  |  |  |  |  |  |  | $ 3,000,000.0 |  |  |  |
2018 ATM [Member] | Sales Agreement With Jefferies LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |
Proceeds from issuance of common shares |  |  |  |  |  |  |  |  | $ 120,600,000 |  |  |  |
Equity issuance costs |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |
Payments of stamp taxes related to securities |  |  |  |  |  |  |  | $ 300,000 | $ 900,000 |  |  |  |
Average issue price of common shares | $ / shares |  |  |  |  |  |  |  |  | $ 44.38 |  |  |  |
Accrued stamp taxes |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  |
2018 ATM [Member] | Sales Agreement With Jefferies LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  |  |  |  |  | $ 125,000,000.0 |  |  |  |  |  |  |
2019 ATM [Member] | Sales Agreement With Jefferies LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |
Proceeds from issuance of common shares |  |  |  |  |  |  |  | $ 195,500,000 |  |  |  |  |
Equity issuance costs |  |  |  |  |  |  |  | $ 4,500,000 |  |  |  |  |
Average issue price of common shares | $ / shares |  |  |  |  |  |  |  | $ 89.47 |  |  |  |  |
2019 ATM [Member] | Sales Agreement With Jefferies LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  |  |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |
2020 ATM [Member] | Sales Agreement With Jefferies LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares sold | shares | 300,000 |  |  |  |  |  |  | 1,800,000 |  |  |  |  |
Proceeds from issuance of common shares | $ 46,700,000 |  |  |  |  |  |  | $ 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
Average issue price of common shares | $ / shares | $ 162.46 |  |  |  |  |  |  | $ 169.57 |  |  |  |  |
2020 ATM [Member] | Sales Agreement With Jefferies LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds |  | $ 350,000.0 |  |  |  |  |  |  |  |  |  |  |
2021 ATM [Member] | Sales Agreement With Jefferies LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares sold | shares |  |  |  |  |  |  | 1,100,000 |  |  |  |  |  |
Proceeds from issuance of common shares |  |  |  |  |  |  | $ 177,800,000 |  |  |  |  |  |
Equity issuance costs |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |
Payments of stamp taxes related to securities |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |
Average issue price of common shares | $ / shares |  |  |  |  |  |  | $ 169.82 |  |  |  |  |  |
2021 ATM [Member] | Sales Agreement With Jefferies LLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate estimated gross proceeds | $ 600,000.0 |  |  |  |  |  |  |  |  |  |  |  |

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