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Acquisitions - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Feb. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Acquisition Date [Line Items]        
Goodwill   $ 1,058,667 $ 586,996 $ 591,047
Total purchase price, net of cash and cash equivalents acquired   $ 988,599    
Electro Scientific Industries Inc [Member]        
Acquisition Date [Line Items]        
Current assets (excluding inventory) $ 208,009      
Inventory 83,036      
Intangible assets 316,200      
Goodwill 472,695      
Property, plant and equipment 65,489      
Long-term assets 9,633      
Total assets acquired 1,155,062      
Current liabilities 51,479      
Non-current deferred taxes 33,123      
Other long-term liabilities 7,159      
Total liabilities assumed 91,761      
Fair value of assets acquired and liabilities assumed 1,063,301      
Less: Cash and cash equivalents acquired (44,072)      
Total purchase price, net of cash and cash equivalents acquired $ 1,019,229