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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended
Apr. 30, 2014
Apr. 30, 2010
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2013
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]
Sep. 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]
Sep. 30, 2014
Dorado Ocean Resources, Ltd. [Member]
Apr. 30, 2010
Dorado Ocean Resources, Ltd. [Member]
Sep. 30, 2014
Neptune Minerals, Inc. [Member]
Dec. 31, 2011
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]
Dec. 31, 2011
Neptune Minerals, Inc. [Member]
Class B non-voting common stock [Member]
Sep. 30, 2014
Neptune Minerals, Inc. [Member]
Common Class B [Member]
Sep. 30, 2014
Neptune Minerals, Inc. [Member]
Series A Preferred Stock [Member]
Apr. 30, 2014
Neptune Minerals, Inc. [Member]
Series A Voting Shares [Member]
Sep. 30, 2014
Neptune Minerals, Inc. [Member]
Common Class A [Member]
Jun. 30, 2012
Chatham Rock Phosphate, Ltd. [Member]
Sep. 30, 2014
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     85,321,008     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                     0    
Net share position in NMI                             6,190,201         6,184,976 5,225        
Accounts receivable transferred between related parties         8,227,675                                        
Accounts receivable converted to common shares, amount     2,347,826 7,826,086 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                         20,100,000                        
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%