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Note 17 - Pension Plan - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Total loss recognized in other comprehensive income	$ 1,690
Pension Plan [Member]
Actuarial loss on remeasurement of projected benefit obligation	4,654
Actuarial gain on remeasurement of fair value of assets	(2,292)
Total loss recognized in other comprehensive income	$ 2,362

X

- Definition

Represents the amount of actuarial gain (loss) on remeasurement of fair value of assets recognized in other comprehensive income under pension and other postretirement benefit plans.

+ 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 actuarial gain (loss) on remeasurement of projected benefit obligation recognized in other comprehensive income under pension and other postretirement benefit plans.

+ References

No definition available.

+ Details

Name:	cigi_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansActuarialGainLossOnRemeasurementOfProjectedBenefitObligation
Namespace Prefix:	cigi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580

+ Details

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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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Balance Type:
Period Type: