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Operating Segments Information - Additional Information (Detail) - Segment	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating segments [abstract]
Number of operating segments	1	1

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- References

No definition available.

+ Details

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- Definition

Number of reportable operating segments.

+ References

No definition available.

+ Details

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Period Type:	duration