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Commitments and Contingencies - BG Joint Venture - Additional Information (Detail)
12 Months Ended
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