Long-term debt, current and non-current, textual (Details) - USD ($) | Mar. 19, 2015 | Jan. 13, 2014 | Mar. 10, 2015 | Mar. 30, 2015 | Mar. 20, 2015 | Apr. 30, 2015 | Jul. 24, 2015 | Oct. 06, 2015 | Nov. 19, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 19, 2014 | Dec. 31, 2013 |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Repayments of Long-term Debt | | | | | | | | | | $ 321,240,000 | $ 48,589,000 | | $ 45,783,000 |
Compensating Balance, Amount | | | | | | | | | | $ 21,500,000 | $ 19,500,000 | | |
Trading Symbol | | | | | | | | | | DSX | | | |
Revolving Credit Facility February 2005 [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Line of Credit Facility, Initiation Date | | | | | | | | | | Feb. 18, 2005 | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | $ 230,000,000 | | | |
Revolving Credit Facility May 2006 [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Line of Credit Facility, Initiation Date | | | | | | | | | | May 24, 2006 | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | $ 300,000,000 | | | |
Line of Credit Facility, Frequency of Payments | | | | | | | | | | semi-annual | | | |
Line of Credit Facility, Periodic Payment | | | | | | | | | | $ 15,000,000 | | | |
Line of Credit Facility, Expiration Date | | | | | | | | | | Jul. 24, 2015 | | | |
Line of Credit Facility, Interest Rate Description | | | | | | | | | | LIBOR plus a margin ranging from 0.75% to 0.85% | | | |
Repayments of Long-term Debt | | | | | | | $ 195,000,000 | | | | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 165,000,000 | | | |
Long-term Debt, Weighted Average Interest Rate | | | | | | | | | | 0.90% | 0.95% | | |
Minimum [Member] | Revolving Credit Facility May 2006 [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Loan Margin Percentage | | | | | | | | | | 0.75% | | | |
Maximum [Member] | Revolving Credit Facility May 2006 [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Loan Margin Percentage | | | | | | | | | | 0.85% | | | |
Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Number Of Vessels Collateral For Debt | | | | | | | | | | 42 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly or semi-annual installments | | | |
Debt Instrument, Maturity Date Range, Start | | | | | | | | | | Feb. 28, 2019 | | | |
Debt Instrument, Maturity Date Range End | | | | | | | | | | Nov. 30, 2022 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Long-term Debt, Weighted Average Interest Rate | | | | | | | | | | 2.47% | 2.68% | | |
Debt Instrument Collateral Amount | | | | | | | | | | $ 1,412,382,000 | | | |
Debt Instrument, Debt Default, Amount | | | | | | | | | | $ 1,419,000 | | | |
Debt Instrument, Debt Default, Description of Violation or Event of Default | | | | | | | | | | As of December 31, 2015, the Company was not in compliance with the minimum required hull cover ratio of one of its term loan agreements, creating a shortfall of $1,419. The Company received a waiver by the bank, which covers the period from December 31, 2015 up to and including December 31, 2016, amending the ratio to a lower level and with the requirement to provide updated valuations by July 31, 2016. | | | |
Secured Debt [Member] | Minimum [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Loan Margin Percentage | | | | | | | | | | 1.00% | | | |
Secured Debt [Member] | Maximum [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Loan Margin Percentage | | | | | | | | | | 3.00% | | | |
Unsecured Senior Notes [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | May 20, 2015 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 63,250,000 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Maturity Date | | | | | | | | | | May 15, 2020 | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | 8.50% | | | |
Debt Instrument, Face Amount Per Note | | | | | | | | | | $ 25 | | | |
Proceeds from Issuance of Unsecured Debt | | | | | | | | | | $ 61,180,000 | | | |
Debt Instrument, Redemption Period, Start Date | | | | | | | | | | May 15, 2017 | | | |
Debt Instrument, Redemption Price, Percentage | | | | | | | | | | 100.00% | | | |
Trading Symbol | | | | | | | | | | DSXN | | | |
Officers And Directors [Member] | Unsecured Senior Notes [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Proceeds from Issuance of Unsecured Debt | | | | | | | | | | $ 12,750,000 | | | |
Commonwealth Bank Of Australia [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Jan. 9, 2014 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 2 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 18,000,000 | | | |
Proceeds From Issuance Of Secured Debt | | $ 18,000,000 | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 2.25% | | | |
Commonwealth Bank Of Australia [Member] | Taka Shipping Company Inc [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 8,500,000 | | | |
Debt Instrument, Number of installments | | | | | | | | | | 24 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 196,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 3,800,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Jan. 13, 2020 | | | |
Commonwealth Bank Of Australia [Member] | Fayo Shipping Company Inc [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 9,500,000 | | | |
Debt Instrument, Number of installments | | | | | | | | | | 32 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 156,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 4,500,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Jan. 13, 2022 | | | |
BNP Paribas [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Dec. 18, 2014 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 2 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 55,000,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | | | | | | | | | $ 53,500,000 | |
Debt Instrument, Number of installments | | | | | | | | | | 14 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | semi-annual | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 1,574,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 31,466,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Nov. 30, 2021 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 2.00% | | | |
Nordea Bank [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Mar. 17, 2015 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 8 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 110,000,000 | | | |
Proceeds From Issuance Of Secured Debt | $ 93,080,000 | | | | | | | | | | | | |
Repayments of Long-term Debt | $ 38,345,000 | | | | | | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 24 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 1,862,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 48,402,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Mar. 19, 2021 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 2.10% | | | |
Deutsche Bank [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Repayments of Long-term Debt | | | $ 28,600,000 | | $ 15,750,000 | | | | | | | | |
ABN AMRO Bank NV [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Mar. 26, 2015 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 3 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 53,000,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | $ 50,160,000 | | | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 24 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 994,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 26,310,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Mar. 30, 2021 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 2.00% | | | |
Danish Ship FInance [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Apr. 29, 2015 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 1 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 30,000,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | | | $ 30,000,000 | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 28 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 500,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 16,000,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Apr. 30, 2022 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 2.15% | | | |
BNP Paribas [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Jul. 22, 2015 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 165,000,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | | | | $ 165,000,000 | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 20 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 69,000,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Jul. 24, 2020 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
BNP Paribas [Member] | First Eight Installments [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 8 | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 2,500,000 | | | |
Loan Margin Percentage | | | | | | | | | | 2.35% | | | |
BNP Paribas [Member] | From 9th To 12th Installment [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 4 | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 5,000,000 | | | |
Loan Margin Percentage | | | | | | | | | | 2.30% | | | |
BNP Paribas [Member] | From 13th to 20th Installment [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 8 | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 7,000,000 | | | |
Loan Margin Percentage | | | | | | | | | | 2.25% | | | |
ING Bank N.V. [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Issuance Date | | | | | | | | | | Sep. 30, 2015 | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 2 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 39,683,000 | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR plus a margin | | | |
Loan Margin Percentage | | | | | | | | | | 1.65% | | | |
ING Bank N.V. [Member] | Ujae Shipping Company Inc [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 27,950,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | | | | | | $ 27,950,000 | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 28 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 466,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 14,907,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Nov. 19, 2022 | | | |
ING Bank N.V. [Member] | Rairok Shipping Company Inc [Member] | Secured Debt [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 11,733,000 | | | |
Proceeds From Issuance Of Secured Debt | | | | | | | | $ 11,733,000 | | | | | |
Debt Instrument, Number of installments | | | | | | | | | | 28 | | | |
Debt Instrument, Frequency of Periodic Payments | | | | | | | | | | quarterly | | | |
Debt Instrument, Periodic Payment, Principal | | | | | | | | | | $ 293,000 | | | |
Debt Instrument, Baloon Payment | | | | | | | | | | $ 3,520,000 | | | |
Debt Instrument, Maturity Date | | | | | | | | | | Oct. 6, 2022 | | | |
Commitment Letter [Member] | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | |
Number Of Subsidiaries, Entered Into Loan Agreement | | | | | | | | | | 3 | | | |
Debt Instrument, Face Amount | | | | | | | | | | $ 75,735,000 | | | |