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Discontinued Operations - Schedule of Reconciliation of Gain on Sale of Subsidiary (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 23, 2017
Mar. 31, 2018
Aug. 11, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash proceeds on disposal [1] $ 134,982    
Legal and professional fees incurred as a result of the Aurum Transaction [1] (3,759)    
Cash [1] 3,083    
Accounts receivable [1] 15,705    
Inventory 89,101 [1]   $ 2,300
Prepaid expenses [1] 1,110    
Property and equipment [1] 11,176    
Intangible assets [1] 343    
Other assets [1] 244    
Deferred income tax asset [1] 6,705    
Accounts payable [1] (27,207)    
Accrued expenses [1] (3,552)    
Long-term debt [1] (333)    
Other long-term liabilities [1] (2,834)    
Total assets [1] 93,541    
Gain on disposal, net of taxes of nil [1] $ 37,682 $ 37,682  
[1] Recast (refer to note 1)