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Summary of Significant Accounting Policies - Additional Information - Basis of Presentation (Details) - USD ($)
shares in Millions
1 Months Ended
Sep. 25, 2017
Sep. 30, 2017
Jul. 01, 2016
Subordinated debt      
Debt Instrument [Line Items]      
Number of warrants to be issued (in units)   11.4  
Debt instrument, principal amount     $ 200,000,000.0
Aggregate proceeds from the debt purchase   $ 140,000,000  
Brookfield      
Debt Instrument [Line Items]      
Purchase price paid in cash $ 610,000,000 $ 610,000,000  
Number of units to be issued/exchanged 244.0 244.0  
Number of warrants to be issued (in units)   62.4  
Teekay Corporation      
Debt Instrument [Line Items]      
Purchase price paid in cash $ 30,000,000 $ 30,000,000  
Number of units to be issued/exchanged 12.0 12.0  
Number of warrants to be issued (in units)   3.1  
Teekay Corporation | Subordinated debt      
Debt Instrument [Line Items]      
Number of warrants to be issued (in units) 11.4    
Aggregate proceeds from the debt purchase $ 140,000,000