Quarterly report pursuant to Section 13 or 15(d)

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

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Line of Credit, Short-Term and Long-Term Borrowings - Long Term Debt (Parenthetical) (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Note payable to banks one [Member]
  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 355,000
Variable interest rate of note payable 3.95%
Balloon payment required under note payable 76,976,000
Due date for note payable November 2015
Note payable to banks two [Member]
  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable 531,400
Fixed interest rate of note payable 3.54%
Balloon payment required under note payable 12,635,000
Due date for note payable December 2015
Note payable to banks three [Member]
  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable 483,900
Fixed interest rate of note payable 3.19%
Balloon payment required under note payable 11,670,000
Due date for note payable June 2016
Note payable to TCF Equipment Finance, Inc. [Member]
  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 30,500
Fixed interest rate of note payable 5.24%
Due date for note payable July 2019