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Fair Value Measurements (Detail 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Total losses      
Goodwill and other asset impairment $ (13,801)us-gaap_GoodwillImpairmentLoss $ 101us-gaap_GoodwillImpairmentLoss $ 274,285us-gaap_GoodwillImpairmentLoss
European Operations      
Total losses      
Goodwill and other asset impairment $ (13,801)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= itg_EuropeanMember