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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Bank overdrafts balance | $ 0 | $ 0 |  |
Estimated useful lives of investment property depreciated using the straight-line method | 20 years |  |  |
Unused net operating losses | $ 13,756 | 18,225 |  |
Net deferred tax assets | (132) | 526 | $ 1,601 | $ 1,831
Tax benefit amount that would have increased profit and equity if the Company was able to recognize all unrecognized deferred tax assets | 3,947 | 4,846 | $ 3,473 |
Unused tax losses [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Net deferred tax assets | $ 197 | $ 619 |  |
Bottom of range [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of investment property depreciated using the straight-line method | 20 years |  |  |
Top of range [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of investment property depreciated using the straight-line method | 30 years |  |  |

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- Definition Tax benefit amount that would have increased profit and equity if the Company was able to recognize all unrecognized deferred tax assets. + References No definition available. + Details
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- Definition The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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