Note 3 - Earnings Per Share (Details) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Weighted Average Dilutive Stock Options and Restricted Stock Outstanding	5.0	5.5

Weighted Average Dilutive Stock Options and Restricted Stock Outstanding.

No definition available.

Name:	nr_WeightedAverageDilutiveStockOptionsAndRestrictedStockOutstanding
Namespace Prefix:	nr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration