Quarterly report pursuant to Section 13 or 15(d)

Line of Credit , Short - Term And Long - Term Borrowings - Additional Information (Detail)

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Line of Credit , Short - Term And Long - Term Borrowings - Additional Information (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule Of Debt Instruments [Line Items]    
Outstanding letters of credit $ 5,800,000  
Short-term borrowings $ 57,654,000 $ 50,413,000