SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Jun. 30, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Principles of consolidation	Principles of consolidation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP which includes the accounts of GS&T and its direct and indirect wholly-owned subsidiaries, including Baltic Trading. All intercompany accounts and transactions have been eliminated in consolidation.
Basis of presentation	Basis of presentation The accompanying condensed consolidated financial statements have been prepared in accordance with U.S. GAAP for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”). In the opinion of management of the Company, all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of financial position and operating results have been included in the statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s annual report on Form 10-K for the year ended December 31, 2015 (the “2015 10-K”). The results of operations for the three and six months ended June 30, 2016 are not necessarily indicative of the operating results to be expected for the year ending December 31, 2016.
Segment reporting	Segment reporting The Company reports financial information and evaluates its operations by charter revenues and not by the length of ship employment for its customers, i.e., spot or time charters. Each of the Company’s vessels serve the same type of customer, have similar operations and maintenance requirements, operate in the same regulatory environment, and are subject to similar economic characteristics. Based on this, the Company has determined that it operates in one reportable segment, after the effective date of the Merger on July 17, 2015, which is engaged in the ocean transportation of drybulk cargoes worldwide through the ownership and operation of drybulk carrier vessels. Prior to the Merger, the Company had two reportable operating segments, GS&T and Baltic Trading.
Vessels, net	Vessels, net Vessels, net is stated at cost less accumulated depreciation. Included in vessel costs are acquisition costs directly attributable to the acquisition of a vessel and expenditures made to prepare the vessel for its initial voyage. The Company also capitalizes interest costs for a vessel under construction as a cost which is directly attributable to the acquisition of a vessel. Vessels are depreciated on a straight-line basis over their estimated useful lives, determined to be 25 years from the date of initial delivery from the shipyard. Depreciation expense for vessels for the three months ended June 30, 2016 and 2015 was $18,541 and $18,730, respectively. Depreciation expense for vessels for the six months ended June 30, 2016 and 2015 was $37,675 and $37,697, respectively. Depreciation expense is calculated based on cost less the estimated residual scrap value. The costs of significant replacements, renewals and betterments are capitalized and depreciated over the shorter of the vessel’s remaining estimated useful life or the estimated life of the renewal or betterment. Undepreciated cost of any asset component being replaced that was acquired after the initial vessel purchase is written off as a component of vessel operating expense. Expenditures for routine maintenance and repairs are expensed as incurred. Scrap value is estimated by the Company by taking the estimated scrap value of $310 per lightweight ton (“lwt”) times the weight of the ship noted in lwt.
Deferred revenue	Deferred revenue Deferred revenue primarily relates to cash received from charterers prior to it being earned. These amounts are recognized as income when earned. Additionally, deferred revenue includes estimated customer claims mainly due to time charter performance issues. As of June 30, 2016 and December 31, 2015, the Company had an accrual of $310 and $498, respectively, related to these estimated customer claims.
Voyage expense recognition	Voyage expense recognition In time charters, spot market-related time charters and pool agreements, operating costs including crews, maintenance and insurance are typically paid by the owner of the vessel and specified voyage costs such as fuel and port charges are paid by the charterer. There are certain other non-specified voyage expenses, such as commissions, which are typically borne by the Company. At the inception of a time charter, the Company records the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer as a gain or loss within voyage expenses. Additionally, the Company records lower of cost or market adjustments to re-value the bunker fuel on a quarterly basis. These differences in bunkers, including lower of cost or market adjustment, resulted in a net loss of $1,508 and $1,566 during the three months ended June 30, 2016 and 2015, respectively. These differences in bunkers, including lower of cost or market adjustments, resulted in a net loss of $3,805 and $3,858 during the six months ended June 30, 2016 and 2015, respectively. Additionally, voyage expenses include the cost of bunkers consumed during short-term time charters pursuant to the terms of the time charter agreement.
Other operating income	Other operating income During the three and six months ended June 30, 2016, the Company recorded other operating income of $182. There was no operating income earned during the three and six months ended June 30, 2015. Other operating income recorded during the three and six months ended June 30, 2016 consists primarily of $157 received from Samsun Logix Corporation (“Samsun”) pursuant to the revised rehabilitation plan that was approved by the South Korean courts on April 8, 2016. Refer to Note 17 — Commitments and Contingencies for further information regarding the bankruptcy settlement with Samsun.
Impairment of vessel assets	Impairment of vessel assets During the three months ended June 30, 2016 and 2015, the Company recorded $67,594 and $0, respectively, related to the impairment of vessel assets in accordance with ASC 360 — “Property, Plant and Equipment” (“ASC 360”). Additionally, during the six months ended June 30, 2016 and 2015, the Company recorded $69,278 and $35,396, respectively, related to the impairment of vessel assets in accordance with ASC 360. At June 8, 2016, the Company determined that the scrapping of nine of its vessels, the Genco Acheron, Genco Carrier, Genco Leader, Genco Pioneer, Genco Prosperity, Genco Reliance, Genco Success, Genco Sugar, and Genco Wisdom, was more likely than not pursuant to the Commitment Letter entered into for the New Credit Facility as defined and disclosed in Note 8 — Debt. Therefore, at June 8, 2016, the time utilized to determine the recoverability of the carrying value of the vessel assets was significantly reduced. After determining that the sum of the estimated undiscounted future cash flows attributable to the aforementioned nine vessels did not exceed the carrying value of the vessels at June 8, 2016, the Company reduced the carrying value of the nine vessels to their net realizable value, which was based on the expected net proceeds from scrapping the vessels. This resulted in an impairment loss of $67,594 during the three and six months ended June 30, 2016. At March 31, 2016, the Company determined that the scrapping of the Genco Marine was more likely than not based on discussions with the Company’s Board of Directors. Therefore, at March 31, 2016, the time utilized to determine the recoverability of the carrying value of the vessel asset was significantly reduced. After determining that the sum of the estimated undiscounted future cash flows attributable to the Genco Marine did not exceed the carrying value of the vessel at March 31, 2016, the Company reduced the carrying value of the Genco Marine to its net realizable value, which was based on the expected proceeds from scrapping the vessel. This resulted in an impairment loss of $0 and $1,684 during the three and six months ended June 30, 2016, respectively. On April 5, 2016, the Board of Directors unanimously approved scrapping the Genco Marine and the sale of the Genco Marine to the scrap yard was completed on May 17, 2016. At March 31, 2015, the Company determined that the sale of the Baltic Lion and Baltic Tiger was more likely than not based on Baltic Trading’s expressed consideration to divest of those vessels. Therefore, at March 31, 2015, the time utilized to determine the recoverability of the carrying value of the vessel assets was significantly reduced. Similarly, after determining that the sum of the estimated undiscounted future cash flows attributable to the Baltic Lion and Baltic Tiger would not exceed the carrying value of the respective vessels at March 31, 2015, the Company reduced the carrying value of both vessels to their estimated fair value, which was determined primarily based on appraisals and third-party broker quotes. This resulted in an impairment loss of $0 and $35,396 during the three and six months ended June 30, 2015, respectively. On April 8, 2015, the Baltic Lion and Baltic Tiger entities were sold to GS&T. Refer to Note 1 — General Information for details pertaining to the sale of these entities.
Loss on disposal of vessels	Loss on disposal of vessels During the three and six months ended June 30, 2016, the Company recorded $77 related to the loss on the sale of the Genco Marine. During the three and six months ended June 30, 2015, the Company recorded $1,210 related to the loss on sale of vessels related to the sale of the Baltic Lion and Baltic Tiger entities to GS&T from Baltic Trading on April 8, 2015.
Noncontrolling interest	Noncontrolling interest Net loss attributable to noncontrolling interest during the three and six months ended June 30, 2015 of $11,620 and $52,293, respectively, reflects the noncontrolling interest’s share of the net loss of the Company’s subsidiary, Baltic Trading, prior to the Merger on July 17, 2015, which owned and employed drybulk vessels in the spot market, in vessel pools or on spot market-related time charters. The spot market represents immediate chartering of a vessel, usually for single voyages. Refer to Note 1— General Information for details pertaining to the Merger.
Investments	Investments The Company holds an investment in the capital stock of Jinhui Shipping and Transportation Limited (“Jinhui”) and in Korea Line Corporation (“KLC”). Jinhui is a drybulk shipping owner and operator focused on the Supramax segment of drybulk shipping. KLC is a marine transportation service company which operates a fleet of carriers which includes carriers for iron ore, liquefied natural gas and tankers for oil and petroleum products. The investments in Jinhui and KLC have been designated as Available For Sale (“AFS”) and are reported at fair value, with unrealized gains and losses recorded in equity as a component of accumulated other comprehensive income (loss) (“AOCI”). The Company classifies the investments as current or noncurrent assets based on the Company’s intent to hold the investments at each reporting date. Investments are reviewed quarterly to identify possible other-than-temporary impairment in accordance with ASC Subtopic 320-10, “Investments — Debt and Equity Securities” (“ASC 320-10”). When evaluating its investments, the Company reviews factors such as the length of time and extent to which fair value has been below the cost basis, the financial condition of the issuer, the underlying net asset value of the issuer’s assets and liabilities, and the Company’s ability and intent to hold the investment for a period of time which may be sufficient for anticipated recovery in market value. Should the decline in the value of any investment be deemed to be other-than-temporary, the investment basis would be written down to fair market value, and the write-down would be recorded to earnings as a loss. Refer to Note 5 — Investments.
Income taxes	Income taxes Pursuant to certain agreements, GS&T technically and commercially managed vessels for Baltic Trading until the Merger, as well as provides technical management of vessels for MEP in exchange for specified fees for these services provided. These services are performed by Genco Management (USA) LLC (“Genco (USA)”), which has elected to be taxed as a corporation for United States federal income tax purposes. As such, Genco (USA) is subject to United States federal income tax on its worldwide net income, including the net income derived from providing these services. Genco (USA) has entered into a cost-sharing agreement with the Company and Genco Ship Management LLC, collectively Manco, pursuant to which Genco (USA) agrees to reimburse Manco for the costs incurred by Genco (USA) for the use of Manco’s personnel and services in connection with the provision of the services for both Baltic Trading and MEP’s vessels. Total revenue earned by the Company for these services during the three months ended June 30, 2016 was $414 of which $0 eliminated upon consolidation. After allocation of certain expenses, there was taxable income of $228 associated with these activities for the three months ended June 30, 2016. This resulted in estimated tax expense of $96 for the three months ended June 30, 2016. Total revenue earned by the Company for these services during the three months ended June 30, 2015 was $2,490 of which $1,671 eliminated upon consolidation. After allocation of certain expenses, there was taxable income of $1,532 associated with these activities for the three months ended June 30, 2015. This resulted in estimated tax expense of $711 for the three months ended June 30, 2015. Total revenue earned by the Company for these services during the six months ended June 30, 2016 was $1,225 of which $0 eliminated upon consolidation. After allocation of certain expenses, there was taxable income of $791 associated with these activities for the six months ended June 30, 2016. This resulted in estimated tax expense of $350 for the six months ended June 30, 2016. Total revenue earned by the Company for these services during the six months ended June 30, 2015 was $4,680 of which $3,051 eliminated upon consolidation. After allocation of certain expenses, there was taxable income of $2,730 associated with these activities for the six months ended June 30, 2016. This resulted in estimated tax expense of $1,229 for the six months ended June 30, 2016. Prior to the Merger, Baltic Trading was subject to income tax on its United States source income. However, as a result of the Merger, Baltic Trading should qualify for the Section 883 exemption of the U.S. Internal Revenue Code of 1986 (as amended) in 2016 and in future taxable years as long as GS&T qualifies for the Section 883 exemption. As such, during the three and six months ended June 30, 2016, there was no United States income tax recorded for Baltic Trading. During the three and six months ended June 30, 2015, Baltic Trading had United States operations that resulted in United States source income of $178 and $765, respectively. Baltic Trading’s estimated United States income tax expense for the three and six months ended June 30, 2015 was $7 and $31, respectively.
Recent accounting pronouncements	Recent accounting pronouncements In February 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-02, “Leases (Topic 842),” which replaces the existing guidance in ASC 840 – Leases. This ASU requires a dual approach for lessee accounting under which a lessee would account for leases as finance leases or operating leases. Both finance leases and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding lease liability. For finance leases, the lessee would recognize interest expense and amortization of the right-of-use asset, and for operating leases, the lessee would recognize a straight-line total lease expense. This ASU is effective for fiscal years beginning after December 15, 2018, and for interim periods within those fiscal years. Lessees and lessors will be required to apply the new standard at the beginning of the earliest period presented in the financial statements in which they first apply the new guidance, using a modified retrospective transition method. The requirements of this standard include a significant increase in required disclosures. The Company is currently evaluating the impact of this adoption on its consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”). This ASU will require that equity investments are measured at fair value with changes in fair value recognized in net income (loss). ASU 2016-01 will be effective for annual periods beginning after December 15, 2017, and interim periods within those years. Earlier adoption is permitted. The Company is currently evaluating the impact of this adoption on its consolidated financial statements. In August 2015, the FASB issued ASU No. 2015-15 (“ASU 2015-15”), which amends presentation and disclosure requirements outlined in ASU 2015-03, “Interest-Imputation of Interest (ASC Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs,” (“ASU 2015-03”) by clarifying guidance for debt issuance costs related to line of credit arrangements by acknowledging the statement by SEC staff that it would not object to presentation of debt issuance costs related to a line of credit arrangement as an asset, and amortizing them ratably over the term of the line of credit arrangement, regardless of whether there were any borrowings outstanding under the agreement. Issued in April 2015, ASU 2015-03 required debt issuance costs related to a recognized debt liability to be presented on the balance sheet as a direct deduction from the debt liability, similar to the presentation of debt discounts. Prior to the issuance of ASU 2015-03, debt issuance costs were required to be presented as deferred charge assets, separate from the related debt liability. ASU 2015-03 does not change the recognition and measurement requirements for debt issuance costs. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015, and early adoption is permitted. The Company adopted ASU 2015-03 during the three months ended March 31, 2016 on a retrospective basis. Refer to Note 8 – Debt. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”), which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. The core principle is that a company should recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five-step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. The standard is effective for annual periods beginning after December 15, 2016, and interim periods therein, and shall be applied either retrospectively to each period presented or as a cumulative effect adjustment as of the date of adoption. On July 9, 2015, the FASB voted to defer the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also permitted early adoption of the standard, but not before the original effective date of December 15, 2016. The Company is evaluating the potential impact of this adoption on its consolidated financial statements. Subsequent to the issuance of ASU 2014-09, the FASB issued the following ASU’s which amend or provide additional guidance on topics addressed in ASU 2014-09. In March 2016, the FASB issued ASU No. 2016-08, “Revenue Recognition - Principal versus Agent” (reporting revenue gross versus net). In April 2016, the FASB issued ASU No. 2016-10, “Revenue Recognition - Identifying Performance Obligations and Licenses.” Lastly, in May 2016, the FASB issued No. ASU 2016-12, “Revenue Recognition - Narrow Scope Improvements and Practical Expedients.” The Company is evaluating the potential impact of this adoption on its consolidated financial statements.