Quarterly report pursuant to Section 13 or 15(d)

Principle Repayment Requirements Under Long Term Agreements Outstanding (Detail)

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Principle Repayment Requirements Under Long Term Agreements Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
2014 $ 3,118  
2015 3,108  
2016 3,091  
2017 3,094  
2018 5,551  
Thereafter 276,000  
Long-term debt $ 293,962 $ 268,980