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Basis of Presentation and General Information (Details)
 3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Jul. 11, 2014
USD ($)
$ / shares
shares
Nov. 05, 2014
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Aug. 19, 2014
Vessels [Line Items]              
Date of Incorporation       Dec. 13, 2006      
Payments to acquire property plant and equipment       $ 473,917,000 $ 518,447,000 $ 127,814,000  
Write-off of deferred finance costs   $ 3,003,000          
Average closing market price | $ / shares   $ 11.854          
Acquisition related costs   $ 9,364,000          
Shares to acquire business | shares   54,104,200          
Daily Management Fee       750      
Share based compensation   $ 1,808,000   $ 2,684,000 5,834,000 1,488,000  
Heron Convertible Loan              
Vessels [Line Items]              
Convertible loan receivable, outstanding amount   23,680,000          
Conversion ratio     0.5        
Write off, Loan receivable   23,680,000          
Convertible loan receivable, outstanding amount net of write-offs   0          
Vessels in operation              
Vessels [Line Items]              
Assets fair value adjustment   79,465,000          
Vessels under construction              
Vessels [Line Items]              
Assets fair value adjustment   $ 158,523,000          
Kamsarmax vessels              
Vessels [Line Items]              
Number of vessels acquired             14
Star Angelina              
Vessels [Line Items]              
DWT 82,981     82,981      
Year Built       2006      
Star Gwyneth              
Vessels [Line Items]              
DWT 82,790     82,790      
Year Built       2006      
ABYO Oprah              
Vessels [Line Items]              
DWT   82,551          
ABYO Audrey              
Vessels [Line Items]              
DWT   175,125          
Astakos              
Vessels [Line Items]              
DWT 58,722     58,722      
Year Built       2012      
Serenity I              
Vessels [Line Items]              
DWT 53,688     53,688      
Daily Management Fee $ 500            
Year Built       2006      
Above market time charters | Madredeus and Amami              
Vessels [Line Items]              
Above market time charters   $ 1,967,000          
Number of time charters   2          
Oceanbulk              
Vessels [Line Items]              
Shares to acquire business | shares   48,395,766          
Oceanbulk | Vessels in operation              
Vessels [Line Items]              
Number of vessels acquired   12          
Oceanbulk | Vessels under construction              
Vessels [Line Items]              
Number of contracts for Newbuildings acquired   25          
Heron Ventures Ltd              
Vessels [Line Items]              
Payments to acquire property plant and equipment         25,000,000    
Shares to acquire vessels | shares   2,115,706          
Value of common shares issued for acquisition of Heron Vessels         25,080,000    
Heron Ventures Ltd | Kamsarmax vessels              
Vessels [Line Items]              
Number of vessels acquired   2          
Pappas Companies              
Vessels [Line Items]              
Shares to acquire business | shares   3,592,728          
Business combination adjustments              
Vessels [Line Items]              
Interest expense         1,816,000 $ 1,412,000  
Acquisition related costs         $ 12,757,000    
Significant charterers              
Vessels [Line Items]              
Accounts receivable $ 456,000     $ 456,000