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Summary of Significant Accounting Policies - Recertification Costs and Deferred Dry Dock Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |
Deferred dry dock expenses, net | $ 19,615 | $ 11,631 |
Accumulated amortization deferred dry dock | 18,300 | 7,500 |
Dry dock amortization expense | $ 10,800 | $ 14,100 | $ 14,800
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Dry dock amortization period | 30 months |  |
Dry dock recertification process period | 1 month |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Dry dock amortization period | 60 months |  |
Dry dock recertification process period | 2 months |  |

X
- Definition Carrying amount of accumulated amortization of deferred dry dock at the end of the reporting period + References No definition available. + Details
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Namespace Prefix: | hlx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Deferred Drydock Expenses, Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Expense related to amortization of deferred dry dock charges + References No definition available. + Details
Name: | hlx_DryDockAmortizationExpense
Namespace Prefix: | hlx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The length of time in which the deferred dry dock costs are amortized. + References No definition available. + Details
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X
- Definition The length of time to complete the dry dock and recertification process. + References No definition available. + Details
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- Details
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