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Acquisitions - Preliminary Allocation of Purchase Price Based on Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Nov. 30, 2018
Aug. 31, 2018
Aug. 20, 2018
Business Acquisition [Line Items]      
Goodwill $ 77,508 $ 78,211  
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  
Total assets acquired   69,147  
Accounts payable and accrued liabilities   12,394  
Total liabilities assumed   12,394  
Net assets acquired   $ 56,753