Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.6
Line of Credit, Short-Term And Long-Term Borrowings - Additional Information (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Debt Instruments [Line Items]    
Outstanding letters of credit $ 3,800,000 $ 3,200,000
Short-term borrowings $ 3,044,000 $ 2,425,000