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Benefit Plans - Components of Company Plan Benefit Expense (Parenthetical) (Details)	6 Months Ended
	Jun. 30, 2022
Compensation And Retirement Disclosure [Abstract]
Age limit for a lump sum payment	55 years

X

- Definition

Minimum age to be eligible to receive lump sum payment upon benefit.

+ References

No definition available.

+ Details

Name:	geo_MinimumAgetoBeEligibletoReceiveLumpSumPaymentUponBenefit
Namespace Prefix:	geo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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