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Related Party Transactions - Additional Information (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Immediate Holding Company [Member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Interest rates on the balance due to related party | 0.00% |
Bottom of range [Member] | PEWC Singapore Co. (Pte) Ltd. [Member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Interest rates on the balance due to related party | 2.00% | 1.61%
Top of range [Member] | PEWC Singapore Co. (Pte) Ltd. [Member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Interest rates on the balance due to related party | 2.34% | 1.86%

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- Definition Interest rates on balances due to related party. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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