Quarterly report pursuant to Section 13 or 15(d)

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

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Line of Credit, Short-Term and Long-Term Borrowings - Long Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 134,391 $ 140,185
Less current installments 11,842 11,668
Total long-term debt 122,549 128,517
Note payable to banks one [Member]
   
Debt Instrument [Line Items]    
Long-term debt 79,412 79,916
Note payable to banks two [Member]
   
Debt Instrument [Line Items]    
Long-term debt 26,315 29,010
Note payable to banks three [Member]
   
Debt Instrument [Line Items]    
Long-term debt 26,759 29,213
Note payable to TCF Equipment Finance, Inc. [Member]
   
Debt Instrument [Line Items]    
Long-term debt 1,905 2,036
Capital lease obligations [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 10