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Goodwill - Summary of Proforma Effect in Net Revenue, Net Income and Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mapi Group      
Business Acquisition [Line Items]      
Net revenue $ 1,811,018 $ 1,750,643  
Net income $ 284,903 $ 263,101  
Basic earnings per share (dollars per share) $ 5.26 $ 4.76  
Diluted earnings per share (dollars per share) $ 5.19 $ 4.66  
ICON Government & Public Health Solutions      
Business Acquisition [Line Items]      
Net revenue   $ 1,713,245 $ 1,639,085
Net income   $ 266,148 $ 244,167
Basic earnings per share (dollars per share)   $ 4.82 $ 4.16
Diluted earnings per share (dollars per share)   $ 4.72 $ 4.05