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Segment Reporting - Segment Results as Presented in Consolidated Financial Statements (Footnote) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
vessel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
vessel
Conventional Tanker Segment | Teekay Corporation      
Segment Reporting Information [Line Items]      
Gain (loss) on contract termination   $ 4.0 $ (1.8)
FPSO Segment      
Segment Reporting Information [Line Items]      
Number of vessels | vessel 2    
FPSO Segment | Petrojarl Knarr FPSO | Teekay Corporation      
Segment Reporting Information [Line Items]      
Acquisition and business development fee     $ 9.7
Towage Segment | Long Distance Towing and Offshore Installation Vessels      
Segment Reporting Information [Line Items]      
Number of vessels | vessel     6
Towage Segment | Long Distance Towing and Offshore Installation Vessels | Teekay Corporation      
Segment Reporting Information [Line Items]      
Acquisition and business development fee     $ 2.2
UMS Segment | Arendal Spirit UMS | Teekay Corporation      
Segment Reporting Information [Line Items]      
Acquisition and business development fee     $ 2.0