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Equity Investment - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended
Mar. 31, 2013
Sep. 30, 2013
Equity Method Investments [Line Items]    
Equity investment made $ 3,687 $ 3,687
Equity investment ownership position   29.27%
Carrying value of equity investment   3,301
Quoted market value of equity investment   $ 4,288