DESCRIPTION OF THE BUSINESS (Details)	12 Months Ended
Dec. 31, 2016 segment facility item	Aug. 04, 2016
DESCRIPTION OF THE BUSINESS
Number of reportable segments \| segment	2
Number of owned vessels in fleet \| item	22
Number of chartered vessels \| item	5
Ocean Transportation \| SSAT
DESCRIPTION OF THE BUSINESS
Ownership interest in SSAT (as a percent)	35.00%
Number of terminal facilities on which SSAT provided terminal and stevedoring services on the U.S. West Coast \| facility	6
MatNav \| Ocean Transportation \| SSAT
DESCRIPTION OF THE BUSINESS
Number of terminal facilities on which SSAT provided terminal and stevedoring services on the U.S. West Coast \| facility	3
Span Alaska
BUSINESS COMBINATION
Percentage interest acquired		100.00%

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Represents the number of chartered vessels.

+ References

No definition available.

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Represents the number of owned vessels.

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Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services.

+ References

No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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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)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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