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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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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
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-Section 50
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