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Note 12 - Redeemable Non-controlling Interests - Reconciliation of the Beginning and Ending NCI Amounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balance	$ 134,803	$ 139,592
Non-controlling interest share of earnings	20,236	20,085
Non-controlling interest redemption increment (note 12)	22,583	3,521
Distributions paid to RNCI	(20,797)	(16,495)
Balance	145,489	134,803
Non-controlling Interest Share of Earnings [Member]
Non-controlling interest share of earnings	16,497	15,943
Non-controlling Interest Redemption Increment [Member]
Non-controlling interest redemption increment (note 12)	22,583	3,521
Non-controlling Interest Distributions Paid to NCI [Member]
Distributions paid to RNCI	(12,870)	(14,428)
Non-controlling Interest Purchase of Interests from NCI Net [Member]
Purchases of interests from RNCI, net	(31,782)	(9,825)
Non-controlling Interest Recognized on Business Acquisitions [Member]
RNCI recognized on business acquisitions	$ 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

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=cigi_NoncontrollingInterestDistributionsPaidToNciMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=cigi_NoncontrollingInterestPurchaseOfInterestsFromNciNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityInterestIssuedOrIssuableByTypeAxis=cigi_NoncontrollingInterestRecognizedOnBusinessAcquisitionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: