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Maturity Profile of Term Loan Net of Debt Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Long-Term Debt    
2013 $ 1,056  
2014 4,263  
2015 4,288  
2016 4,306  
2017 4,338  
2018 4,363  
2019 636,306  
Term loan amounts outstanding $ 658,920 $ 661,861