Quarterly report pursuant to Section 13 or 15(d)

Line of Credit, Short-Term and Long-Term Borrowings - Long-Term Borrowings (Detail)

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Line of Credit, Short-Term and Long-Term Borrowings - Long-Term Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term borrowings $ 71,991 $ 72,904
Less current installments 1,810 1,801
Total long-term borrowings 70,181 71,103
Modification Loan [Member] | Construction Loan Agreement [Member] | Joint Venture with HF Logistics [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 65,875 66,604
Note payable to Luen Thai Enterprise, LTD [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 5,731 5,745
Notes payable to TCF Finance [Member] | Equipment Notes [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 385 $ 555