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Long-Term Debt - Future Principal Payments of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
2014 $ 5,714  
2015 643  
2016     
2017     
2018     
Thereafter     
Total long-term debt $ 6,357 $ 12,071