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Note 4 - Commitments and Contingencies (Details Textual) $ in Millions	Mar. 31, 2016 USD ($)
Community Development Related to Claim	$ 180.2

X

- Definition

Community development related to the claim.

+ References

No definition available.

+ Details

Name:	icfi_CommunityDevelopmentRelatedToClaim
Namespace Prefix:	icfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant