Commitments and Contingencies - Additional Information (Detail) In Millions, unless otherwise specified	9 Months Ended	1 Months Ended			9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2010 Haiyu Fishery Limited Corporation	Sep. 30, 2013 Jinghai Group USD ($)	Sep. 30, 2013 Jinghai Group CNY	Sep. 30, 2013 Jinghai Group Maximum
Product Liability Contingency [Line Items]
Contract Term		10 years
Quantity of marine fuel the Company has the right and obligation to supply					20,000
Annual payments for the first three years of the agreement if certain volume levels are achieved			$ 0.04	0.30
Description of lessee leasing arrangements, operating leases	The leases are for a period of one to ten years, and may be extended at managements option.
Operating leases, future minimum payments receivable	$ 3.6