SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of vessel assets (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Impairment of vessel assets	$ 527	$ 0
Loss on the disposal of replaced equipment	$ 527

Amount of write-down of vessel assets, including but not limited to, assets to be disposed of and held-for-use.

No definition available.

Name:	gnk_VesselAssetImpairmentCharges
Namespace Prefix:	gnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration