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Rent Expense (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Rent Expense [Line Items] |  |
Rent expense | $ 650,000 | $ 650,000
Auburn, Washington |  |
Rent Expense [Line Items] |  |
Rent expense | 27,000 |
Lease Expiration Date | Month to Month |
Baton Rouge, Louisiana |  |
Rent Expense [Line Items] |  |
Rent expense | 15,000 |
Lease Expiration Date | Feb. 28, 2015 |
Champaign, Illinois |  |
Rent Expense [Line Items] |  |
Rent expense | 327,000 |
Lease Expiration Date | Dec. 31, 2014 |
Charlotte, North Carolina |  |
Rent Expense [Line Items] |  |
Rent expense | 62,000 |
Lease Expiration Date | Mar. 31, 2016 |
Hampstead, New Hampshire |  |
Rent Expense [Line Items] |  |
Rent expense | 28,000 |
Lease Expiration Date | Aug. 31, 2017 |
Pearl River, New York |  |
Rent Expense [Line Items] |  |
Rent expense | 93,000 |
Lease Expiration Date | Aug. 31, 2018 |
Pottsboro, Texas |  |
Rent Expense [Line Items] |  |
Rent expense | 18,000 |
Lease Expiration Date | Aug. 31, 2014 |
Stony Point, NY |  |
Rent Expense [Line Items] |  |
Rent expense | 116,000 |
Lease Expiration Date | Jun. 30, 2016 |
Tulsa, Oklahoma |  |
Rent Expense [Line Items] |  |
Rent expense | $ 26,000 |
Lease Expiration Date | Dec. 31, 2014 |

X
- Definition Lease expiration period description + References No definition available. + Details
Name: | hdsn_LeaseExpirationPeriodDescription
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | hdsn_RentExpenseLineItems
Namespace Prefix: | hdsn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration