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Other Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Nov. 30, 2010
Dec. 31, 2010
Related Party Transaction [Line Items]    
Proceeds received from sale of vessel $ 21,500 $ 21,556
Gain on sale of vessel $ 4,300 $ 4,340