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Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [abstract]
Antidilutive effect of share options	0	0

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Antidilutive securities excluded from computation of earnings per share amount1.

+ References

No definition available.

+ Details

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Period Type:	duration