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Note 11 - Redeemable Non-controlling Interests - Reconciliation of the Beginning and Ending NCI Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Balance | $ 145,489 | $ 134,803
RNCI share of earnings |  | 20,319
Non-controlling interest redemption increment (note 11) | 7,709 | 22,393
Distributions paid to RNCI | (18,871) | (20,797)
Balance | 343,361 | 145,489
Non-controlling Interest Share of Earnings [Member] |  |
RNCI share of earnings | 20,491 | 16,687
Non-controlling Interest Redemption Increment [Member] |  |
Non-controlling interest redemption increment (note 11) | 7,709 | 22,393
Non-controlling Interest Distributions Paid to NCI [Member] |  |
Distributions paid to RNCI | (16,396) | (12,870)
Non-controlling Interest Purchase of Interests from NCI Net [Member] |  |
Purchases of interests from RNCI, net | 1,111 | (31,782)
Non-controlling Interest Recognized on Business Acquisitions [Member] |  |
RNCI recognized on business acquisitions | $ 184,957 | $ 16,258

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_
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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=114867106&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 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 4: 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=84234705&loc=SL4591551-111686 + 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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- 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=109223946&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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