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Commitments and Contingencies - BG Joint Venture - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($)
Long-term Purchase Commitment [Line Items] |
Shipbuilding and crew training obligation incurred | $ 4,200,000
Shipbuilding and crew training obligation incurred, 2016 | 6,000,000
Shipbuilding and crew training obligation incurred, 2017 | 3,800,000
Shipbuilding and crew training obligation incurred, 2018 | 4,100,000
Shipbuilding and crew training obligation incurred, 2019 | 400,000
BG Joint Venture [Member] |
Long-term Purchase Commitment [Line Items] |
Debt facility used to finance a portion of estimated fully built-up cost | 787,000,000
Fully built up cost | 1,000,000,000
BG Joint Venture [Member] | Pro rata share [Member] |
Long-term Purchase Commitment [Line Items] |
Proportionate share of the newbuilding installments, net of the existing financing in 2016 | 7,900,000
Proportionate share of the newbuilding installments, net of the existing financing in 2017 | 15,000,000
Proportionate share of the newbuilding installments, net of the existing financing in 2018 | 17,300,000
Proportionate share of the newbuilding installments, net of the existing financing in 2019 | $ 6,300,000

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