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
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term borrowings $ 100,712 $ 116,488
Less current installments 30,565 101,407
Total long-term borrowings 70,147 15,081
Notes payable to banks [Member] | Modified loan agreement [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 69,879  
Notes payable to banks [Member] | Master agreement one [Member]    
Debt Instrument [Line Items]    
Long-term borrowings   77,900
Notes payable to banks [Member] | Master agreement two [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 13,582 17,940
Notes payable to banks [Member] | Master agreement three [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 15,220 19,159
Notes payable to TCF Finance [Member] | Equipment agreement [Member]    
Debt Instrument [Line Items]    
Long-term borrowings 1,270 $ 1,489
Loans Payable To Banks [Member] | Master agreement four [Member]    
Debt Instrument [Line Items]    
Long-term borrowings $ 761