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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Vessel | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Depreciation of vessels and equipment | $ 83.4 | $ 70.1 | $ 71.4
Interest costs capitalized to vessels and equipment | $ 8.2 | $ 3.1 | $ 1.3
Spain [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Tax rate in Spain | 28.00% |  |
Number of vessels | Vessel | 2 |  |
Effective income tax rate on revenue by Spanish vessels tax credit | 90.00% |  |
Effective tax rate on revenues by Spanish vessels | 2.80% |  |
Conventional Tankers [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Estimated useful life in years | 25 years |  |
Liquefied Petroleum Gas [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Estimated useful life in years | 30 years |  |
Liquefied Natural Gas [Member] |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Estimated useful life in years | 35 years |  |

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