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Income Tax Expense and Deferred Taxes - Summary of Unrecognized Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Unrecognized deferred tax assets
Tax losses	$ 167,030	$ 164,100
Other deductible temporary differences	11,253	9,968
Total unrecognized deferred tax assets	$ 178,283	$ 174,068

X

- Definition

Unrecognized deferred tax assets.

+ References

No definition available.

+ Details

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X

- Definition

Unrecognized deferred tax assets.

+ References

No definition available.

+ Details

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X

- Definition

The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

+ References

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- Definition

The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit]

+ References

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