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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item customer	Dec. 31, 2019 customer item	Dec. 31, 2018 customer
Concentration Risk
Number of financial institutions with which the entity maintains its cash and cash equivalents | item	5	4
Cash insured by financial institutions | $	$ 0
Voyage Revenues | Customer Concentration Risk
Concentration Risk
Number of customers	166	170	182
Major Customers	0	0	0

X

- Definition

Represents the number customers of the entity from which revenue was earned.

+ References

No definition available.

+ Details

Name:	gnk_ConcentrationRiskNumberOfCustomers
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of financial institutions with which the entity maintains its cash and cash equivalents.

+ References

No definition available.

+ Details

Name:	gnk_ConcentrationRiskNumberOfFinancialInstitutionsWithWhichEntityMaintainsCashAndCashEquivalents
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of external customers from which the entity generated 10 percent or more of revenues.

+ References

No definition available.

+ Details

Name:	gnk_EntityWideRevenueMajorCustomerNumber
Namespace Prefix:	gnk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=gnk_VoyageRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: