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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Trade accounts receivable arising from contracts with customers |  | $ 522,300 | $ 602,100 |  |
Operating lease, right-of-use asset |  | 136,292 | 133,864 |  |
Operating lease, lease liability |  | 139,062 | 137,823 |  |
Foreign exchange transaction losses |  | $ (28,800) | $ (27,400) | $ (10,500) |
Maximum remaining expiration period for foreign currency forward contracts |  | 1 year |  |  |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payment terms |  | 30 days |  |  |
Timing between shipment and delivery |  | 1 day |  |  |
Property, plant and equipment, useful life |  | 2 years |  |  |
Finite-lived intangible assets, useful life |  | 5 years |  |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Payment terms |  | 90 days |  |  |
Timing between shipment and delivery |  | 45 days |  |  |
Property, plant and equipment, useful life |  | 60 years |  |  |
Finite-lived intangible assets, useful life |  | 25 years |  |  |
Planned Major Maintenance Activities |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 12 months |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 139,100
Operating lease, lease liability |  |  |  |  | $ 139,100
Mineral Resources Limited Wodgina Project |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Interest percentage acquired | 60.00% |  |  |  |
Ownership percentage | 60.00% | 60.00% |  |  |

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