Leases - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)
Leases [Abstract]
Minimum sublease income to be received in the future	$ 1.5

Future amount of sublease income excluding finance and operating lease expense.

No definition available.

Name:	hlx_LesseeOperatingSubleaseFutureMinimumSubleaseRentals
Namespace Prefix:	hlx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant