v3.5.0.2

Acquisition of Entities under Common Control - Additional Information (Detail) $ in Thousands		3 Months Ended			9 Months Ended
	Dec. 18, 2015 USD ($) Vehicle	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Return of capital					$ 15,000	$ (239)
Net income		$ (5,457)		$ 40,950	56,009	126,076
Revenues		104,621		126,401	409,192	345,207
Entities under Common Control [Member]
Business Acquisition [Line Items]
Net income		$ 0		(263)	$ 0	1,636
Revenues				$ 1,000		$ 8,400
Entities under Common Control [Member] | SPT Explorer LLC and Navigator Spirit LLC [Member]
Business Acquisition [Line Items]
Number of vessels | Vehicle	2
Business acquisition, assumed working capital	$ 39,000
Assumption of outstanding debt	49,600
Amount paid to acquire business	30,400		$ 8,600
Net assets acquired	25,000
Return of capital	14,000
Entities under Common Control [Member] | SPT Explorer LLC and Navigator Spirit LLC [Member] | Teekay Corporation [Member]
Business Acquisition [Line Items]
Amount to terminate time charters	2,900
Contractual amount	1,500
Entities under Common Control [Member] | SPT Explorer LLC and Navigator Spirit LLC [Member] | Working Capital [Member]
Business Acquisition [Line Items]
Business acquisition, assumed working capital	$ 8,600

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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