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Segments - Additional Information (Detail)	Mar. 31, 2019 operating_division
Segment Reporting [Abstract]
Number of operating divisions	3

X

- Definition

Number of Divisions

+ References

No definition available.

+ Details

Name:	nes_NumberOfDivisions
Namespace Prefix:	nes_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration