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Equity Method Investments - Excalibur and Excelsior Joint Ventures - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2015 USD ($) Vessel | Jul. 31, 2013 | Dec. 31, 2015 USD ($) | Feb. 28, 2019 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total principal |  |  | $ 2,015,472,000 |  | $ 1,924,124,000
Percentage of ownership in joint venture |  |  | 100.00% |  |
Minimum [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Interest bearing percentage |  |  | 0.30% |  |
Maximum [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Interest bearing percentage |  |  | 2.80% |  |
Interest rate swap agreements [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Derivative, term of contract |  | 8 years |  |  |
Scenario Forecast [Member] | Interest rate swap agreements [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Principal amount |  |  |  | $ 133,400,000 |
Excalibur and Excelsior [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of vessels | Vessel | 2 |  |  |  |
Carrying value of guarantee liability | $ 400,000 |  | $ 300,000 |  |
Excalibur and Excelsior [Member] | Minimum [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of ownership in joint venture | 49.00% |  |  |  |
Excalibur and Excelsior [Member] | Maximum [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of ownership in joint venture | 50.00% |  |  |  |
Excalibur and Excelsior [Member] | Maturing In 2019 [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total principal | $ 172,800,000 |  |  |  |
Excalibur and Excelsior [Member] | Interest rate swap agreements [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Derivative, term of contract | 4 years |  |  |  |
Principal amount | $ 172,800,000 |  |  |  |
LIBOR-based interest for the payment of a fixed rate of interest | 1.46% |  |  |  |
Excalibur and Excelsior [Member] | LIBOR [Member] | Maturing In 2019 [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Interest bearing percentage | 2.75% |  |  |  |

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