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Goodwill - Summary of Estimates of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 27, 2017
Sep. 15, 2016
Dec. 31, 2018
Jul. 27, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 15, 2016
Business Acquisition [Line Items]              
Goodwill     $ 756,260   $ 769,058 $ 616,088  
Cash outflows     $ 1,645   $ 144,131 $ 54,209  
Mapi Group              
Business Acquisition [Line Items]              
Cash $ 19,649            
Property, plant and equipment 4,872            
Goodwill 130,270            
Accounts receivable 15,874            
Unbilled revenue 6,984            
Prepayments and other current assets 2,587            
Other receivables 1,430            
Income taxes receivable 4,262            
Accounts payable (2,994)            
Payments on account (31,445)            
Other liabilities (24,952)            
Non-current other liabilities (1,061)            
Non-current deferred tax liability (11,104)            
Net assets acquired 145,776            
Cash outflows 144,131            
Working capital adjustment 1,645            
Total consideration 145,776            
Other liabilities adjustment       $ 3,900      
Property and equipment adjustment       1,700      
Accounts receivable adjustment       1,700      
Income taxes receivable adjustment       1,500      
Unbilled revenue adjustment       (4,800)      
Prepayments and other current assets adjustment       (1,900)      
Other receivables adjustment       (1,000)      
Payments on account adjustment       (2,600)      
Deferred tax liabilities adjustment       $ (9,100)      
ICON Government & Public Health Solutions              
Business Acquisition [Line Items]              
Cash   $ 3,168         $ 3,168
Property, plant and equipment   939         939
Goodwill   35,969         35,969
Accounts receivable   11,431         11,431
Unbilled revenue   3,868         3,868
Prepayments and other current assets   1,673         1,673
Accounts payable   (165)         (165)
Other liabilities   (5,569)         (5,569)
Non-current other liabilities   (7)         (7)
Net assets acquired   58,396         58,396
Total consideration   58,396          
Other liabilities adjustment             1,100
Accounts receivable adjustment             (300)
Unbilled revenue adjustment             1,100
Accounts payable adjustment             (500)
Order book | Mapi Group              
Business Acquisition [Line Items]              
Finite-lived intangible assets 13,012            
Order book | ICON Government & Public Health Solutions              
Business Acquisition [Line Items]              
Finite-lived intangible assets   1,668         1,668
Customer lists | Mapi Group              
Business Acquisition [Line Items]              
Finite-lived intangible assets $ 18,392            
Customer lists | ICON Government & Public Health Solutions              
Business Acquisition [Line Items]              
Finite-lived intangible assets   4,012         4,012
Brand | ICON Government & Public Health Solutions              
Business Acquisition [Line Items]              
Finite-lived intangible assets   $ 1,409         $ 1,409