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Related Party Transactions - Additional Information (Detail)	Dec. 31, 2017	Dec. 31, 2016
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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- Details

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