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Note 9 - Leases (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Lessee, Operating Lease, Lease Not yet Commenced | $ 150,692
Minimum [Member] |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year) | 1 year
Minimum [Member] | Premise Leases [Member] |
Lessee, Operating Lease, Term of Contract (Year) | 1 year
Minimum [Member] | Equipment Leases [Member] |
Lessee, Lease, Term of Contract (Year) | 1 year
Maximum [Member] |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year) | 15 years
Maximum [Member] | Premise Leases [Member] |
Lessee, Operating Lease, Term of Contract (Year) | 15 years
Maximum [Member] | Equipment Leases [Member] |
Lessee, Lease, Term of Contract (Year) | 5 years

X
- Definition The term of contract for leases held by the lessee. + References No definition available. + Details
Name: | cigi_LesseeLeaseTermOfContract
Namespace Prefix: | cigi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of operating lease for lessee, lease not yet commenced. + References No definition available. + Details
Name: | cigi_LesseeOperatingLeaseLeaseNotYetCommenced
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=cigi_PremiseLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=cigi_EquipmentLeasesMember
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: |