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v3.19.3.a.u2

Leases - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019
Minimum |
Finance lease, remaining term | 1 year
Maximum |
Finance lease, remaining term | 77 years
Operating lease, renewal term | 10 years

X
- Definition Lessee, Lease, Renewal Term + References No definition available. + Details
Name: | geo_LesseeLeaseRenewalTerm
Namespace Prefix: | geo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Remaining Lease Term + References No definition available. + Details
Name: | geo_LesseeRemainingLeaseTerm
Namespace Prefix: | geo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |