Other Financial Liabilities - Additional Information (Detail)
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12 Months Ended |
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Dec. 31, 2017
SGD ($)
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Dec. 31, 2017
USD ($)
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Dec. 20, 2017 |
Mar. 31, 2017
USD ($)
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Mar. 30, 2017
SGD ($)
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Dec. 21, 2016
USD ($)
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May 22, 2015
SGD ($)
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| DBS Bank Ltd [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Credit facility maturity period |
Three years
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| DBS Bank Ltd [Member] | Top of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Credit facility with bank |
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$ 30,000,000
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| Consolidated tangible net worth ratio |
100.00%
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100.00%
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| DBS Bank Ltd [Member] | Bottom of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Consolidated tangible net worth |
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$ 350,000,000
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| Credit facility with BOTM Singapore Branch [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Credit facility maturity period |
Three years
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| Refinancing of unsecured multi-currency revolving credit facility |
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$ 30,000,000
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| Credit facility with BOTM Singapore Branch [Member] | Top of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Consolidated tangible net worth ratio |
200.00%
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200.00%
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| Facility limit |
$ 30,000,000
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| Credit facility with BOTM Singapore Branch [Member] | Bottom of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Consolidated tangible net worth |
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$ 120,000,000
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| Sumitomo branch [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Credit facility maturity period |
Three years
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| Refinancing of unsecured multi-currency revolving credit facility |
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$ 30,000,000
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| Sumitomo branch [Member] | Top of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Consolidated tangible net worth ratio |
200.00%
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200.00%
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| Facility limit |
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$ 30,000,000
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| Sumitomo branch [Member] | Bottom of range [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Consolidated tangible net worth |
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$ 200,000,000
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| Forward contract [Member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Non-deliverable forward foreign exchange contract |
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$ 15,300,000
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| Exchange rate |
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7.0439
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