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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items] |  |  |
Out-of-period adjustments | $ 5,100 |  |
Equity in net income of unconsolidated investments | 84,487 | $ 59,637 | $ 27,978
Joint ventures | 499,756 | 429,794 |
Foreign exchange transaction (losses) gains | $ (11,100) | $ 2,400 | $ 51,800
Maximum remaining expiration period for foreign currency forward contracts | 1 year |  |
Excess tax benefits | $ 8,800 |  |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 2 years |  |
Definite-lived intangible assets useful life | 5 years |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life | 60 years |  |
Definite-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 |  |
Saudi Organometallic Chemicals Company |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Ownership percentage | 50.00% |  |
Equity in net income of unconsolidated investments | $ 3,800 |  |
Joint ventures | $ 4,500 |  |

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