Commitments and Contingencies - Additional Information (Detail) - USD ($)
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3 Months Ended |
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Oct. 18, 2016 |
Jan. 22, 2016 |
Dec. 10, 2015 |
Sep. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
| Loss Contingencies [Line Items] |
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| Proceeds from insurance settlement |
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$ 29,600,000
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| Insurance proceeds in restricted cash reclassified from other receivables |
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$ 29,600,000
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| Disbursements of accrued claims and settlements |
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$ 23,500,000
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| Other Receivables [Member] |
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| Loss Contingencies [Line Items] |
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| Insurance receivable |
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$ 29,600,000
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| Accrued Expense [Member] |
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| Loss Contingencies [Line Items] |
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| Accrued claim settlement |
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$ 23,500,000
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| Thomas, et al. v. MagnaChip Semiconductor Corp. et al. [Member] |
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| Loss Contingencies [Line Items] |
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| Damages sought, value |
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$ 23,500,000
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| Shareholder Derivative Actions [Member] |
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| Loss Contingencies [Line Items] |
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| Proceeds from insurance settlement |
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$ 3,000,000
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| Shareholder Derivative Actions [Member] | Subsequent Event [Member] |
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| Loss Contingencies [Line Items] |
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| Attorneys' fee and litigation expenses |
$ 750,000
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| Period of appeal |
60 days
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