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Acquisitions - Preliminary Allocation of Purchase Price Based on Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 20, 2018
Aug. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 78,211   $ 68,590
Net assets acquired   $ 56,800  
GBW Railcar Services LLC      
Business Acquisition [Line Items]      
Cash and cash equivalents 5,000    
Accounts receivable, net 12,230    
Inventories 18,106    
Property, plant and equipment, net 16,748    
Intangibles and other assets, net 9,200    
Goodwill 7,863 $ 15,100  
Total assets acquired 69,147    
Accounts payable and accrued liabilities 12,394    
Total liabilities assumed 12,394    
Net assets acquired $ 56,753