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Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Inventory [Line Items] |  |
Inventories | $ 37,017 us-gaap_InventoryNet | $ 33,967 us-gaap_InventoryNet
Refrigerant and cylinders [Member] |  |
Inventory [Line Items] |  |
Inventories | 8,152 us-gaap_InventoryNet / us-gaap_PublicUtilitiesInventoryAxis = hdsn_RefrigerantAndCylindersMember | 8,238 us-gaap_InventoryNet / us-gaap_PublicUtilitiesInventoryAxis = hdsn_RefrigerantAndCylindersMember
Packaged refrigerants [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 28,865 us-gaap_InventoryNet / us-gaap_PublicUtilitiesInventoryAxis = hdsn_PackagedRefrigerantsMember | $ 25,729 us-gaap_InventoryNet / us-gaap_PublicUtilitiesInventoryAxis = hdsn_PackagedRefrigerantsMember

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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