Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details) (USD $)	6 Months Ended							3 Months Ended	6 Months Ended		6 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Sea-Cat Crewzer II [Member]	Jun. 30, 2013 Mexmar [Member]	Jun. 30, 2013 SCFCo Holdings [Member]	Jun. 30, 2013 Bunge Scf Grain [Member]	Jun. 30, 2013 Witt O'Brien's LLC [Member]	Mar. 31, 2013 Corporate Joint Venture [Member]	Jun. 30, 2013 Offshore Marine Services Joint Ventures [Member]	Jun. 30, 2013 Offshore Support Vessels [Member] equipment	Jun. 30, 2013 Offshore Support Vessels [Member] Sea-Cat Crewzer II [Member] equipment	Jun. 30, 2013 Offshore Support Vessels [Member] Mexmar [Member] equipment	Jun. 30, 2013 Very Large Gas Carrier [Member] equipment	Jun. 30, 2013 Subsequent Event [Member] Dorian LPG [Member]	Jun. 30, 2013 C Lift L L C [Member]	Jun. 06, 2013 C Lift L L C [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																100.00%
Equity Method Investment, Ownership Percentage																50.00%
Payments to Acquire Businesses, Gross															$ 12,700,000
Business Acquisition, Preexisting Relationship, Gain (Loss) Recognized																4,200,000
Partners' Capital Account, Contributions, Cash			11,500,000	5,900,000	2,900,000			500,000						42,100,000
Partners' Capital Account, Contributions, Noncash														14,900,000
Number Of Equipments Delivered											1	1
Proceeds From Property And Equipment Sales To Fifty Percent Or Less Owned Companies			24,100,000	36,400,000
Payments to Acquire Machinery and Equipment			23,000,000	30,400,000
Secured Debt			1,100,000	6,000,000
Secured Debt, Repayments				6,000,000
Loans/notes receivable				1,700,000
Temporary Working Capital Advances Provided during the Period					1,800,000	2,500,000
Temporary Working Capital Advances Repaid during the Period					1,800,000	500,000
Outstanding Working Capital Advances At End Of Period					2,300,000	7,000,000
Proceeds from Equity Method Investment, Dividends or Distributions	8,315,000	25,641,000					1,200,000		400,000
Unrecorded Unconditional Purchase Obligation, Maximum Quantity										17			2
Guarantor Obligations, Maximum Exposure, Undiscounted	14,900,000
Allocable Share of Uncalled Capital	$ 2,400,000