Annual report pursuant to Section 13 and 15(d)

Long-Term Borrowings - Long-Term Borrowings (Detail)

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Long-Term Borrowings - Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term borrowings $ 72,904 $ 68,942
Less current installments 1,801 1,783
Total long-term borrowings 71,103 67,159
Modification Loan [Member] | Construction Loan Agreement [Member] | Joint Venture with HF Logistics [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 66,604 68,059
Note payable to Luen Thai Enterprise, LTD [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 5,745  
Notes payable to TCF Finance [Member] | Equipment Notes [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 555 $ 883