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Benefit Plans - Components of Company Plan Benefit Expense (Parenthetical) (Details) | 6 Months Ended
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Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract] |
Age limit for a lump sum payment | 55 years

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- Definition Minimum age to be eligible to receive lump sum payment upon benefit. + References No definition available. + Details
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Namespace Prefix: | geo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration