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Subsequent Events - Summary of Consideration Paid and Preliminary Purchase Price Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 102,844 $ 102,638
IWT [Member] | Subsequent Event [Member]      
Business Acquisition [Line Items]      
Cash $ 48,489    
Total current assets, excluding cash 68,675    
Property, plant and equipment, net 82,424    
Goodwill 578,709    
Intangible assets, net 475,000    
Other assets 14,410    
Total current liabilities (26,495)    
Deferred tax liabilities (109,846)    
Other liabilities (2,877)    
Total fair value of consideration transferred $ 1,128,489