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Short-term and long-term debt - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Oct. 25, 2013 | Dec. 31, 2013 | Feb. 15, 2013 | Jun. 01, 2012
Debt Disclosure [Line Items] |  |  |  |  |
Maximum borrowing under PNC facility |  |  |  | $ 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |
Fees and expenses relating to creation of PNC facility | 112,000 us-gaap_DeferredFinanceCostsNet |  |  |  |
Available borrowing under PNC facility | 15,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity |  |  |  |
PNC Facility effective rate of interest | 4.25%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd |  |  |  |
Interest rate description under PNC facility | Interest charges with respect to loans are computed on the actual principal amount of loans outstanding during the month at a rate per annum equal to (A) with respect to Domestic Rate Loans (as defined in the PNC Facility), the sum of (i) a rate per annum equal to the higher of (1) the base commercial lending rate of PNC, (2) the federal funds open rate plus .5% and (3) the daily LIBOR plus 1%, plus (ii) .5% and (B) with respect to Eurodollar Rate Loans, the sum of the Eurodollar Rate plus 2.75%. |  |  |  |
Earnings Before Interest Taxes Depreciation And Amortization | 1,116,000 hdsn_EarningsBeforeInterestTaxesDepreciationAndAmortization |  |  |  |
Borrowings outstanding under PNC facility | 10,056,000 us-gaap_LineOfCredit |  |  |  |
Principal balance of this mortgage note | 437,000 hdsn_BuildingAndLandMortgage |  | 603,000 hdsn_BuildingAndLandMortgage |  |
Capital leased assets gross | 57,000 us-gaap_CapitalLeasedAssetsGross |  |  |  |
Minimum |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Fixed charge coverage ratio | 1.00 hdsn_FixedChargeCoverageRatio / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.00 hdsn_FixedChargeCoverageRatio / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Fixed charge coverage ratio | 1.10 hdsn_FixedChargeCoverageRatio / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.10 hdsn_FixedChargeCoverageRatio / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Term Loan |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Maximum borrowing under PNC facility |  |  |  | 4,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = hdsn_TermLoanMember |
Term Loan | Base Rate |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Debt instrument, description of variable rate basis | Base Rate plus one percent |  |  |  |
Term Loan | Eurodollar |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Debt instrument, description of variable rate basis | Eurodollar Rate plus two and three quarters of one percent |  |  |  |
Revolving Credit Facility |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Maximum borrowing under PNC facility |  |  |  | 36,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Revolving Credit Facility | Base Rate |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Debt instrument, description of variable rate basis | Base Rate (as defined in the PNC Facility) plus one percent |  |  |  |
Revolving Credit Facility | Eurodollar |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Debt instrument, description of variable rate basis | Eurodollar Rate plus two and three quarters of one percent |  |  |  |
Mortgage Note |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Maximum borrowing under PNC facility |  |  |  |  | $ 855,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = hdsn_MortgageNoteMember
PNC Facility effective rate of interest |  |  |  |  | 4.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LineOfCreditFacilityAxis = hdsn_MortgageNoteMember
PNC credit Facility expiration date | Jun. 01, 2017 |  |  |  |
Vehicle And Equipment Loans | Minimum |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
PNC Facility effective rate of interest | 2.90%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LineOfCreditFacilityAxis = hdsn_VehicleAndEquipmentLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Vehicle And Equipment Loans | Maximum |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
PNC Facility effective rate of interest | 8.90%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LineOfCreditFacilityAxis = hdsn_VehicleAndEquipmentLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |

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- Definition Earnings before interest taxes depreciation and amortization. + References No definition available. + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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