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Long-term Borrowings -Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2007
Dec. 31, 2007
Convertible Advances Maturing In November First Two Thousand Seveenteen
Dec. 31, 2008
Convertible Advances Maturing In July Twenty Third Two Thousand Eighteen
Dec. 31, 2008
Convertible Advances Maturing In August Twenty Two Two Thousand Eighteen
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.28%   2.73% 3.34%
Convertible Debt $ 10,000,000   $ 5,000,000 $ 5,000,000
Debt Instrument, Maturity Date   Nov. 01, 2017 Jul. 23, 2018 Aug. 22, 2018
Debt Instrument Callable Quarterly Date     Jul. 23, 2009 Aug. 22, 2011