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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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