Long-Term Debt - Additional Information - Term Loans (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) vessel subsidiary term_loan tanker	Dec. 31, 2016 USD ($) term_loan
Debt Instrument [Line Items]
Number of subsidiaries with outstanding term loans guaranteed \| subsidiary	3
Ownership interest percentage	50.00%
Number of outstanding term loans \| term_loan	2	3
Aggregate principal amount	$ 3,173,229	$ 3,237,703
Carrying amount of debt	3,123,728	3,182,894
Arendal Spirit UMS \| Short-term debt
Debt Instrument [Line Items]
Carrying amount of debt	82,500
U.S. Dollar-denominated Term Loans due through 2021 \| Guarantee of indebtedness of others
Debt Instrument [Line Items]
Guaranteed term loans	42,800
U.S. Dollar-denominated Term Loans due through 2021 \| Guarantee of indebtedness of others \| Joint venture
Debt Instrument [Line Items]
Guaranteed term loans	42,800
Term loans \| U.S. Dollar-denominated Term Loans due through 2021
Debt Instrument [Line Items]
Aggregate principal amount	85,574	112,406
Term loans \| U.S. Dollar-denominated Term Loans due through 2028
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,623,440	$ 2,109,926
Long-term debt
Debt Instrument [Line Items]
Number of debt facilities refinanced \| term_loan	2
Long-term debt \| Equipment
Debt Instrument [Line Items]
Number of vessels \| vessel	20
Long-term debt \| Shuttle tankers
Debt Instrument [Line Items]
Number of vessels \| vessel	3
Long-term debt \| Newbuildings
Debt Instrument [Line Items]
Number of vessels \| vessel	1
Long-term debt \| FSO units
Debt Instrument [Line Items]
Number of vessels \| vessel	2
Long-term debt \| FPSO units
Debt Instrument [Line Items]
Number of vessels \| vessel	4
Long-term debt \| Towing and offshore installation vessels
Debt Instrument [Line Items]
Number of vessels \| vessel	10
Long-term debt \| U.S. Dollar-denominated Term Loans due through 2021
Debt Instrument [Line Items]
Number of vessels \| tanker	3
Long-term debt \| U.S. Dollar-denominated Term Loans due through 2021 \| Guarantee of indebtedness of others
Debt Instrument [Line Items]
Ownership interest percentage	50.00%

Debt Instrument, Number Of Debt Instruments Extinguished

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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