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Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Aug. 31, 2017
Jun. 30, 2017
Sep. 30, 2017
Business Acquisition [Line Items]      
Net cash paid at acquisition     $ 79,465
Goodwill   $ 250,342 270,103
Kaiam Laser Limited, Inc      
Business Acquisition [Line Items]      
Net cash paid at acquisition $ 79,500    
Goodwill $ 18,307    
Business acquisition, transaction costs     1,000
Business acquisition, revenue of acquired entity     600
Business acquisition, (loss) earnings of acquired entity     (3,700)
Integrated Photonics, Inc      
Business Acquisition [Line Items]      
Net cash paid at acquisition   39,436  
Goodwill   17,107  
Business acquisition, transaction costs   300  
Business acquisition, revenue of acquired entity     5,400
Business acquisition, (loss) earnings of acquired entity     $ 400
Payment of additional amount for working capital adjustment   700  
Fair value of accounts receivable acquired   2,100  
Fair value of accounts receivable gross contractual amount   2,100  
Integrated Photonics, Inc | Upon Achievement of Financial And Transitional Objectives Relating to Finance Information Technology And Human Resources      
Business Acquisition [Line Items]      
Business acquisitions, contingent consideration, current   2,500  
Integrated Photonics, Inc | Upon Achievement of Financial And Transitional Objectives Relating to Finance Information Technology And Human Resources | Maximum      
Business Acquisition [Line Items]      
Business acquisitions, contingent consideration   $ 2,500