Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Narrative (Details)

v3.19.1
Revenue Recognition - Narrative (Details)
3 Months Ended
Mar. 31, 2019
segment
category
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Number of product categories | category 6
Number of operating segments 4
Revenue, performance obligation, description of timing We generally expense volume incentives when incurred because the amortization period would have been one year or less. All of our contracts with customers have a duration of less than one year, the value of any unsatisfied performance obligations is insignificant.
NSP Americas; NSP Russia, Central and Eastern Europe; and NSP China  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Number of operating segments 3
Synergy WorldWide  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Number of operating segments 1