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
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term borrowings $ 82,918 $ 84,595
Less current installments 14,420 15,653
Total long-term borrowings 68,498 68,942
Notes payable to banks [Member] | Modified loan agreement [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 69,151 69,515
Notes payable to banks [Member] | Master agreement three [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 12,649 13,886
Notes payable to TCF Finance [Member] | Equipment agreement [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 1,118 $ 1,194