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Fair values of assets acquired and liabilities assumed of Clinical RM (Detail) - USD ($)
$ in Thousands
Sep. 15, 2016
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 759,137 $ 769,058 $ 616,088
Clinical Research Management Inc.        
Business Acquisition [Line Items]        
Cash $ 3,168      
Property, plant and equipment 939      
Goodwill 35,969      
Accounts receivable 11,431      
Unbilled revenue 3,868      
Prepayments and other current assets 1,673      
Accounts payable (165)      
Other liabilities (5,569)      
Non-current other liabilities (7)      
Net assets acquired 58,396      
Total consideration 58,396      
Clinical Research Management Inc. | Customer lists        
Business Acquisition [Line Items]        
Intangible assets 4,012      
Clinical Research Management Inc. | Order backlog        
Business Acquisition [Line Items]        
Intangible assets 1,668      
Clinical Research Management Inc. | Brand        
Business Acquisition [Line Items]        
Intangible assets $ 1,409