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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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- Definition Represents the number of chartered vessels. + References No definition available. + Details
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- Definition Represents the number of ports terminal facilities on which the investee provides terminal and stevedoring services. + References No definition available. + Details
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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 + Details
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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 + Details
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