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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Feb. 01, 2019
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization $ 290,880   $ 290,880 $ 244,025
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization 79,028   79,028 63,788
Patents, Trademarks, Trade Names and Other [Member]        
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization 44,036   44,036 $ 42,954
Electro Scientific Industries Inc [Member]        
Finite-Lived Intangible Assets [Line Items]        
Acquired intangible assets, purchase price   $ 316,200    
Accumulated Amortization 316,200   316,200  
Finite lived intangible asset , gross favorable lease 6,428   6,428  
Electro Scientific Industries Inc [Member] | Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Acquired intangible assets, purchase price 25,400 $ 25,400    
Electro Scientific Industries Inc [Member] | Patents, Trademarks, Trade Names and Other [Member]        
Finite-Lived Intangible Assets [Line Items]        
Accumulated Amortization 3,445   3,445  
Electro Scientific Industries Inc [Member] | Completed Technology [Member]        
Finite-Lived Intangible Assets [Line Items]        
Acquired intangible assets, purchase price     $ 274,000  
Electro Scientific Industries Inc [Member] | Trademarks Tradenames and Backlog [Member]        
Finite-Lived Intangible Assets [Line Items]        
Acquired intangible assets, purchase price $ 16,800