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Commitments And Contingencies And Other Matters - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 21, 2016 USD ($) | Jan. 31, 2016 USD ($) renewal_option | Dec. 31, 2015 USD ($) payment_installment | Jul. 31, 2015 USD ($) | Feb. 28, 2014 vessel | Sep. 30, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jun. 30, 2015 USD ($) | Nov. 30, 2014 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total investment |  |  | $ 2,544,857 |  |  |  | $ 2,450,890 | $ 2,544,857 |  |  |
Charter fee deposit |  |  | $ 12,544 |  |  |  | 12,544 | 12,544 |  |  |
Total rental expense |  |  |  |  |  |  | 87,800 | 134,300 | $ 147,200 |  |
Total rental income |  |  |  |  |  |  | 1,600 | $ 1,400 | $ 800 |  |
Minimum rentals to be received in the future |  |  |  |  |  |  | 2,000 |  |  |  |
Scotland [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of lease agreement |  | 15 years |  |  |  |  |  |  |  |  |
Number of renewal options | renewal_option |  | 2 |  |  |  |  |  |  |  |  |
Term of renewal option |  | 5 years |  |  |  |  |  |  |  |  |
Annual minimum lease payment |  | $ 800 |  |  |  |  |  |  |  |  |
Q7000 [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contract amount |  |  |  |  |  | $ 346,000 |  |  |  |  |
Percentage of contract price paid |  |  | 80.00% |  |  |  |  |  |  |  |
Number of installments to be paid | payment_installment |  |  | 3 |  |  |  |  |  |  |  |
Total investment |  |  |  |  |  |  | 194,600 |  |  |  |
Payment of shipyard costs | $ 69,200 |  |  |  |  |  |  |  |  |  |
Q7000 [Member] | Contract Signing [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of contract price paid |  |  |  |  |  | 20.00% |  |  |  |  |
Payment of shipyard costs |  |  |  |  |  |  | 69,200 |  |  |  |
Q7000 [Member] | Due June 2016 [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of contract price paid |  |  | 20.00% |  |  |  |  |  |  |  |
Q7000 [Member] | Issuance of Completion Certificate [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of contract price paid |  |  | 20.00% |  |  |  |  |  |  |  |
Q7000 [Member] | Vessel Delivery [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of contract price paid |  |  | 40.00% |  |  |  |  |  |  |  |
Q7000 [Member] | Capital Addition Purchase Commitments [Member] | Extend Scheduled Delivery [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total investment |  |  |  |  |  |  |  |  |  | $ 14,500 |
Q7000 [Member] | Capital Addition Purchase Commitments [Member] | Contract Signing [Member] | Extend Scheduled Delivery [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payment of shipyard costs |  |  |  | $ 7,300 |  |  |  |  |  |  |
Monohull Vessels [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of chartered vessels | vessel |  |  |  |  | 2 |  |  |  |  |  |
Topside Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total investment |  |  |  |  |  |  | $ 200,700 |  |  |  |
Siem Helix 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Charter fee deposit |  |  |  |  |  |  |  |  |  |  | $ 12,500
Siem [Member] | Monohull Vessels [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of charter agreement |  |  |  |  | 7 years |  |  |  |  |  |
Petrobras [Member] |  |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  |  | 4 years |  |  |  |  |  |

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