v3.8.0.1

Acquisition of SPT - Summary of Preliminary Estimates of Fair Values of SPT Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
ASSETS |  |  |  |  |
Goodwill |  | $ 0 | $ 8,059 | $ 0 |
LIABILITIES |  |  |  |  |
Purchase price of acquisition |  |  | 0 | 31,870 | $ 0
Ship to Ship Transfer Business [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash, cash equivalents and short-term restricted cash | $ 1,292 |  |  |  |
Accounts receivable | 10,332 |  |  |  |
Prepaid expenses and other current assets | 3,763 |  |  |  |
Vessels and equipment | 6,475 |  |  |  |
Other assets | 143 |  |  |  |
Goodwill | 8,059 |  |  |  |
Total assets acquired | 52,564 |  |  |  |
LIABILITIES |  |  |  |  |
Accounts payable | (3,650) |  |  |  |
Accrued liabilities | (3,276) |  |  |  |
Total liabilities assumed | (6,926) |  |  |  |
Net assets acquired | 45,638 |  |  |  |
Gross carrying amount |  | 30,900 | 22,500 | 30,900 |
Accumulated amortization |  | 1,300 | 4,800 | 1,300 |
Net carrying amount |  | 29,600 | 17,700 | $ 29,600 |
Amortization expense, 2017 |  |  | 3,200 |  |
Amortization expense, 2018 |  |  | 2,900 |  |
Amortization expense, 2019 |  |  | 2,200 |  |
Amortization expense, 2020 |  |  | 2,000 |  |
Amortization expense, 2021 |  |  | 1,800 |  |
Amortization expense, thereafter |  |  | $ 5,600 |  |
Purchase price of acquisition | 47,300 |  |  |  |
Ship to Ship Transfer Business [Member] | Settlement of Preexisting Obligation [Member] |  |  |  |  |
LIABILITIES |  |  |  |  |
Purchase price of acquisition |  | $ 1,400 |  |  |
Ship-to-Ship Transfer [Member] | Conventional Tanker [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Goodwill | 1,900 |  |  |  |
Ship-to-Ship Transfer [Member] | Ship-to-Ship Transfer [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Goodwill | 6,200 |  |  |  |
Customer Relationships [Member] | Ship to Ship Transfer Business [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Intangible assets subject to amortization | 17,901 |  |  |  |
LIABILITIES |  |  |  |  |
Amortization period |  |  | 10 years |  |
Customer Contracts [Member] | Ship to Ship Transfer Business [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Intangible assets subject to amortization | $ 4,599 |  |  |  |
LIABILITIES |  |  |  |  |
Amortization period |  |  | 7 years 7 months 6 days |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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