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Commitments and Contingencies - Additional Information - Shuttle Tankers (Detail)
$ in Millions
1 Months Ended 3 Months Ended
Jun. 30, 2015
USD ($)
vessel
Sep. 30, 2016
vessel
Dec. 31, 2016
USD ($)
Shuttle Tanker [Member]      
Loss Contingencies [Line Items]      
Operating lease arrangement period, lessor (in years) 15 years    
Number of vessels | vessel 3 1  
Estimated cost of project $ 372.0    
Prepaid Expense 73.1    
Payments due in 2017 228.6    
Purchase obligation due in 2017 $ 70.6    
Shuttle Tanker [Member] | Newbuildings [Member]      
Loss Contingencies [Line Items]      
Number of vessels | vessel 3    
Debt instrument, face amount     $ 250.0
Unused borrowing capacity     $ 201.6
Navion Hispania [Member]      
Loss Contingencies [Line Items]      
Number of vessels | vessel   1