Investments in Unconsolidated Entities - Additional Information (Detail) (USD $)	0 Months Ended		6 Months Ended		12 Months Ended		12 Months Ended				0 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended				6 Months Ended
	Apr. 30, 2014	Apr. 30, 2010	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013 Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]	Jun. 30, 2014 Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]	Sep. 30, 2013 Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]	Dec. 31, 2009 SMM Project, LLC [Member] Unit Sqkms	Apr. 30, 2010 Dorado Ocean Resources, Ltd. [Member]	Dec. 31, 2011 Dorado Ocean Resources, Ltd. [Member]	Jun. 30, 2014 Dorado Ocean Resources, Ltd. [Member]	Apr. 30, 2010 Dorado Ocean Resources, Ltd. [Member]	Jun. 30, 2014 Neptune Minerals, Inc. [Member]	Dec. 31, 2011 Neptune Minerals, Inc. [Member]	Apr. 30, 2014 Neptune Minerals, Inc. [Member]	Dec. 31, 2010 Neptune Minerals, Inc. [Member]	Dec. 31, 2013 Neptune Minerals, Inc. [Member] Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]	Jun. 30, 2012 Chatham Rock Phosphate, Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Book value of investment										$ 500,000
Ownership percentage										25.00%				41.25%	29.00%
Mineral exploration area										150,000
Number of membership units										5
Common stock, shares issued			85,229,295			83,882,577								450
Acquisition of additional shares											1,200					2,066,600
Fair value of investment														2,000,000
Investment repayment period			3 years
Marine service account receivables		2,000,000
Shares issued per each share exchanged																1,000
Shares received from exchange																1,650,000
Shares owned												1,650
Net share position in NMI															6,184,976
Accounts receivable transferred between related parties					8,227,675
Accounts receivable converted to common shares, amount			2,347,826	4,695,652	2,500,000
Common shares received in settlement of accounts receivable/Preferred non-voting Class A stock	5,225				2,500,000
Value of shares																$ 1.00
Receivable reserve																		8,227,675
Settlement of accounts receivable, share					2,500,000
Loss from unconsolidated entity													19,800,000
Investment at a carrying value															0		522,500
Convertible notes									500,000
Convertible notes Interest rate							8.00%	8.00%											6.00%
Convertible notes maturity date							Apr. 26, 2014
Conversion share price per share							$ 12.00
Preferred voting Class A stock	522,500
Deep sea mining exploratory services																				$ 1,680,000
Shares received from CRP																				9,320,348
Equity stake in CRP																				5.90%