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Inventory - Schedule of Current and Non-current Inventory (Detail) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
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Inventory Disclosure [Abstract] |  |
Recovered cargo | $ 4,728,436 | $ 5,681,264
Packaging | 56,236 | 70,560
Merchandise | 279,959 | 405,467
Merchandise reserve | (251,023) | (371,332)
Total inventory | $ 4,813,608 | $ 5,785,959

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