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Maturities of Long-term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
2013 $ 36,102  
2014 10,800  
2015 58,370  
2016 33,745  
2017 67,436  
Thereafter 106,160  
Debt $ 312,613 $ 217,104