XML 69 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Note 2 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2018
Long-term Incentive Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years
Minimum [Member] | Long-term Incentive Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years
Minimum [Member] | Customer Lists and Relationships [Member] |
Finite-Lived Intangible Asset, Useful Life | 4 years
Minimum [Member] | Investment Management Contracts [Member] |
Finite-Lived Intangible Asset, Useful Life | 5 years
Minimum [Member] | Trademarks and Trade Names [Member] |
Finite-Lived Intangible Asset, Useful Life | 2 years
Minimum [Member] | Management Contracts and Other [Member] |
Finite-Lived Intangible Asset, Useful Life | 2 years
Maximum [Member] | Long-term Incentive Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 10 years
Maximum [Member] | Customer Lists and Relationships [Member] |
Finite-Lived Intangible Asset, Useful Life | 20 years
Maximum [Member] | Investment Management Contracts [Member] |
Finite-Lived Intangible Asset, Useful Life | 15 years
Maximum [Member] | Trademarks and Trade Names [Member] |
Finite-Lived Intangible Asset, Useful Life | 10 years
Maximum [Member] | Management Contracts and Other [Member] |
Finite-Lived Intangible Asset, Useful Life | 10 years
Building [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 20 years
Building [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 40 years
Vehicles [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Vehicles [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 5 years
Furniture and Fixtures [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Furniture and Fixtures [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years
Computer Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment, Useful Life | 3 years
Computer Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 5 years
Leasehold Improvements [Member] | Maximum [Member] |
Property, Plant and Equipment, Useful Life | 10 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=cigi_LongTermIncentivePlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=cigi_CustomerListsAndRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=cigi_InvestmentManagementContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=cigi_ManagementContractsAndOtherMember
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: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |