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Long-term Debt - Summary of Scheduled Principal Repayments of Revolving Bank Credit Facility and Promissory Note (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
2013 $ 1,000  
2014 17,480  
Total $ 17,480 $ 23,185