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Note 6 - Acquisition-related Items - Composition of Acquisition-related Expense (Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Transaction costs | $ 13,030 | $ 16,169
Contingent consideration fair value adjustments (note 24) | 42,686 | 23,393
Contingent consideration compensation expense | 5,292 | 6,286
Acquisition-related expense | $ 61,008 | $ 45,848

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- Definition Represents information about the contingent consideration compensation expense. + References No definition available. + Details
Name: | cigi_ContingentConsiderationCompensationExpense
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents information about the contingent consideration fair value adjustments. + References No definition available. + Details
Name: | cigi_ContingentConsiderationFairValueAdjustments
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs which have been expensed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration