Quarterly report pursuant to Section 13 or 15(d)

Principal Repayment Requirements under Long-Term Debt Agreements Outstanding (Detail)

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Principal Repayment Requirements under Long-Term Debt Agreements Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Long Term Debt Maturities Repayments Of Principal [Line Items]    
2013 $ 20,115  
2014 3,849  
2015 29,459  
2016 71  
2017 216,635  
Thereafter 441  
Long-term debt $ 270,570 $ 274,803