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Derivative Instruments - Gain (Loss) for Derivative Instruments Not Designated or Qualifying as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gains (losses) on derivative instruments	$ (32,397)	$ (42,586)	$ (36,568)
Unrealized gains (losses) on derivative instruments	12,375	(2,096)	22,568
Gain (loss) on derivative instruments, net	(20,022)	(44,682)	(14,000)
Interest rate swap agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gains (losses) on derivative instruments	(28,968)	(39,406)	(38,089)
Unrealized gains (losses) on derivative instruments	14,768	4,204	18,868
Gain (loss) on derivative instruments, net	(14,200)	(35,202)	(19,221)
Interest rate swaption agreements [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gains (losses) on derivative instruments	0
Unrealized gains (losses) on derivative instruments	(783)
Gain (loss) on derivative instruments, net	(783)
Interest rate swap agreements termination [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gains (losses) on derivative instruments	0	(2,319)
Unrealized gains (losses) on derivative instruments	0
Gain (loss) on derivative instruments, net	0	(2,319)
Toledo Spirit time-charter derivative [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gains (losses) on derivative instruments	(3,429)	(861)	1,521
Unrealized gains (losses) on derivative instruments	(1,610)	(6,300)	3,700
Gain (loss) on derivative instruments, net	$ (5,039)	$ (7,161)	$ 5,221

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- Definition

Derivative instruments not designated as hedging instruments realized gain loss net.

+ References

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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