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Fair value of assets acquired and liabilities assumed of Mapi Group (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 27, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Goodwill   $ 759,137   $ 769,058 $ 616,088
Cash outflows   $ 1,645 $ 0    
Mapi Group [Member]          
Business Acquisition [Line Items]          
Cash $ 19,649        
Property, plant and equipment 4,872        
Goodwill 129,344        
Intangible assets 32,330        
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