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Investments in Unconsolidated Entities - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 6 Months Ended
Apr. 30, 2010
Mar. 31, 2013
Dec. 31, 2011
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Face Value $10,000,000, 8% Convertible Senior Note Payable [Member]
Mar. 31, 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]
Apr. 30, 2014
Subsequent Event [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]
Mar. 31, 2014
Dorado Ocean Resources, Ltd. [Member]
Mar. 31, 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]
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%     29.60%        
Mineral exploration area                   150,000                
Number of membership units                   5                
Common stock, shares issued       83,939,140 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   3,130,435 2,500,000                              
Common shares received in settlement of accounts receivable/Preferred non-voting Class A stock     2,500,000           55,225                  
Value of shares                             $ 1.00      
Receivable reserve                               8,227,675    
Settlement of accounts receivable, share     2,500,000                              
Loss from unconsolidated entity                         19,700,000          
Investment at a carrying value                           0        
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                                   6.50%