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Financial Instruments - Additional Information (Detail) - Toledo Spirit time-charter derivative [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Average daily tanker rate over remaining duration of charter contract | $ 34,093 | $ 27,554
Discount rate over remaining duration of contract | 7.50% | 7.40%

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