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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 9 Months Ended | 12 Months Ended | 6 Months Ended |
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Apr. 30, 2010 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | 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] | Sep. 30, 2013 Dorado Ocean Resources, Ltd. [Member] | Sep. 30, 2013 Neptune Minerals, Inc. [Member] | Dec. 31, 2011 Neptune Minerals, Inc. [Member] | Jun. 30, 2012 Chatham Rock Phosphate, Ltd. [Member] | Sep. 30, 2013 Chatham Rock Phosphate, Ltd. [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value of investment |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 25.00% | 41.25% |  |  | 30.00% |  |  |
Mineral exploration area |  |  |  |  |  |  | 150,000 |  |  |  |  |  |  |
Number of membership units |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Common stock, shares issued |  | 81,484,779 |  |  | 75,416,203 |  |  | 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 |  |  |  |  |  |  |  |  |  |  | 6,216,600 |  |  |
Accounts receivable transferred between related parties |  |  |  | 8,227,675 |  |  |  |  |  |  |  |  |  |
Accounts receivable converted to common shares, amount |  | 7,826,086 | 2,347,826 | 2,500,000 |  |  |  |  |  |  |  |  |  |
Converted common shares received |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |
Value of shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.00 |  |
Receivable reserve |  |  |  |  |  |  |  |  |  |  |  | 8,227,675 |  |
Loss from unconsolidated entity |  |  |  |  |  |  |  |  |  | 14,700,000 |  |  |  |
Investment at a carrying value |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Convertible notes |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |
Convertible notes Interest rate |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |
Convertible notes maturity date |  |  |  |  |  | Apr. 26, 2014 |  |  |  |  |  |  |  |
Conversion price per share related to option elected |  |  |  |  |  | $ 20.00 |  |  |  |  |  |  |  |
Conversion share price per share |  |  |  |  |  | $ 12.00 |  |  |  |  |  |  |  |
Deep sea mining exploratory services |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,680,000 |
Shares received from CRP |  |  |  |  |  |  |  |  |  |  |  |  | 9,320,348 |
Equity stake in CRP |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.90%

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