Commitments And Contingencies And Other Matters (Narrative) (Details) (USD $)			1 Months Ended		1 Months Ended		1 Months Ended	25 Months Ended	3 Months Ended		1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013 Q7000 [Member]	Mar. 31, 2014 Q7000 [Member]	Aug. 31, 2012 Helix 534 [Member]	Mar. 31, 2014 Helix 534 [Member]	Mar. 31, 2012 Q5000 [Member]	Mar. 31, 2014 Q5000 [Member]	Mar. 31, 2014 Monohull Vessels [Member] property	Mar. 31, 2014 Topside Equipment [Member]	Sep. 30, 2013 Contract Signing [Member] Q7000 [Member]	Sep. 30, 2013 Vessel Delivery [Member] Q7000 [Member]
Commitments And Contingencies [Line Items]
Long-term purchase commitment			$ 346,000,000				$ 386,500,000
Property and equipment	1,966,500,000	1,963,706,000		80,800,000		219,400,000		213,700,000		100,000
Payments to acquire property, plant, and equipment					$ 85,000,000			$ 173,800,000			$ 69,200,000
Long-term purchase commitment percentage											20.00%	80.00%
Number of vessels under construction									2