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Commitments and Contingencies - Additional Information - Shuttle Tankers (Detail) - Shuttle Tanker [Member]
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Vessel
Sep. 30, 2015
Vessel
Jun. 30, 2016
USD ($)
Vessel
Loss Contingencies [Line Items]      
Operating lease arrangement period, lessor     15 years
Number of vessels | Vessel 3 1  
Estimated cost of project     $ 368.0
Payments made towards commitments     46.7
Purchase obligation due (remainder of 2015)     34.1
Purchase obligation due in 2016     219.0
Purchase obligation due in 2017     68.6
Purchase obligation due in 2018     $ 250.0
Newbuildings [Member]      
Loss Contingencies [Line Items]      
Number of vessels | Vessel     3