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
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
2014 $ 3,253  
2015 5,098  
2016 3,075  
2017 3,071  
2018 7,078  
Thereafter 285,089  
Long-term debt $ 306,664 $ 268,980