Summary of significant accounting policies - Additional Information (Detail 1)	12 Months Ended
Dec. 31, 2014 lb	Dec. 31, 2013 lb
Significant Accounting Policies [Line Items]
Production Or Importation Of Hcfc	51,000,000hdsn_ProductionOrImportationOfHcfc	63,000,000hdsn_ProductionOrImportationOfHcfc

This represents the production or importation of Hcfc.

No definition available.

Name:	hdsn_ProductionOrImportationOfHcfc
Namespace Prefix:	hdsn_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration