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Inventory - Schedule of Current and Non-current Inventory (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
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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