Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Pool management fees and commissions	$ (9,813)	$ (10,445)	$ (5,292)
Commercial management fees	(1,870)	(1,236)	(1,117)
Vessel operating expenses	(182,598)	(137,164)	(98,403)
Strategic and administrative service fees	(10,122)	(8,356)	(8,676)
Entities Under Common Control [Member]
Related Party Transaction [Line Items]
Pool management fees and commissions	9,813	10,445	5,292
Commercial management fees	1,870	1,236	1,117
Strategic and administrative service fees	(15,508)	(14,701)	(15,767)
Bareboat charter revenues	0	0	1,156
Entities Under Common Control [Member] \| Explorer Spirit [Member]
Related Party Transaction [Line Items]
Bareboat charter revenues			900
Entities Under Common Control [Member] \| Navigator Spirit [Member]
Related Party Transaction [Line Items]
Bareboat charter revenues			300
Time-charter [Member]
Related Party Transaction [Line Items]
Revenues	5,404	392	13,728
Time-charter [Member] \| Entities Under Common Control [Member]
Related Party Transaction [Line Items]
Revenues	0	4,558	6,572
Technical management fee [Member]
Related Party Transaction [Line Items]
Vessel operating expenses	(9,155)	(7,039)	(5,613)
Technical management fee [Member] \| Entities Under Common Control [Member]
Related Party Transaction [Line Items]
Revenues	11,742	10,413	9,798
Vessel operating expenses	0	(430)	(399)
Lay-up Services [Member]
Related Party Transaction [Line Items]
Revenues	302	0	0
LNG terminal services [Member] [Member]
Related Party Transaction [Line Items]
Revenues	70	0	0
Other Income [Member] \| Entities Under Common Control [Member]
Related Party Transaction [Line Items]
Revenues	$ 5,482	$ 4,023	$ 3,065

Bareboat charter revenues.

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- Definition

Commercial Management Fees Related Party

+ References

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- Definition

Pool Management Fees And Commissions Related Party

+ References

No definition available.

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- Definition

The aggregate direct operating costs incurred during the reporting period.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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