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Note 18 - Redeemable Non-controlling Interests - Reconciliation of the Beginning and Ending NCI Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Balance | $ 359,150 | $ 343,361
Non-controlling interest redemption increment (note 18) | 15,843 | 7,853
Distributions paid to RNCI | (35,698) | (31,858)
Purchase of interests from RNCI, net | (19,100) | (14,011)
Balance | 442,375 | 359,150
Non-controlling Interest Share of Earnings [Member] |  |
RNCI share of earnings | 27,550 | 24,558
Non-controlling Interest Redemption Increment [Member] |  |
Non-controlling interest redemption increment (note 18) | 15,843 | 7,853
Non-controlling Interest Distributions Paid to NCI [Member] |  |
Distributions paid to RNCI | (33,293) | (29,662)
Non-controlling Interest Recognized on Business Acquisitions [Member] |  |
RNCI recognized on business acquisitions | $ 92,225 | $ 27,051

X
- Definition This element represents the fair value of the noncontrolling interest recognized in the acquiree during the fiscal period. + References No definition available. + Details
Name: | cigi_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestAmountRecognizedFairValue
Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow (inflow) during the period for redemption (purchase) of redeemable noncontrolling interests. + References No definition available. + Details
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Namespace Prefix: | cigi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4591551-111686 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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X
- Definition Portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent entity which is not redeemable by the parent entity. + References No definition available. + Details
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X
- Definition Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders. + References No definition available. + Details
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- Details
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