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Investments in Unconsolidated Entities - Additional Information (Detail) - USD ($) |  | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Jun. 30, 2012 | Sep. 30, 2015 | Dec. 31, 2013 | Jul. 31, 2013 | Dec. 31, 2011
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Convertible notes |  |  |  |  | $ 500,000 |
Maturity date |  |  |  | Apr. 26, 2014 |  |
Common Class B [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Series A preferred non-voting stock converted, Number of non-voting common stock issued | 522,500 |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt instrument, number of shares converted | 5,225 |  |  |  |  |
Neptune Minerals, Inc. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 6,190,201 |  |  |
Ownership percentage |  |  | 28.00% |  |  |
Investment carrying value |  |  | $ 0 |  |  |
Neptune Minerals, Inc. [Member] | Face Value $10,000,000, 8% Convertible Senior Note Payable [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Convertible notes, interest rate |  |  |  | 6.00% |  |
Neptune Minerals, Inc. [Member] | Common Class B [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 6,184,976 |  |  |
Neptune Minerals, Inc. [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net share position in NMI |  |  | 5,225 |  |  |
Neptune Minerals, Inc. [Member] | Common Class A [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Shares owned |  |  | 0 |  |  |
Neptune Minerals, Inc. [Member] | Series A Voting Shares [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment carrying value | $ 522,500 |  |  |  |  |
Dorado Ocean Resources, Ltd. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 41.00%
Loss from unconsolidated entity |  |  | $ 20,700,000 |  |  |
Chatham Rock Phosphate, Ltd. [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment carrying value |  |  | $ 0 |  |  |
Deep sea mining exploratory services |  | $ 1,680,000 |  |  |  |
Shares received from CRP |  | 9,320,348 |  |  |  |
Equity stake in CRP |  |  | 3.00% |  |  |

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