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Business Combination - Additional Information (Detail) $ in Thousands | 5 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Vessel
Business Acquisition [Line Items] |  |
Total revenues | $ 178,753 | $ 406,520
Net loss | $ (38,726) | (171,771)
GulfMark Term Loan Facility |  |
Business Acquisition [Line Items] |  |
Outstanding term loan facility |  | 100,000
Repayment of outstanding term loan facility |  | 72,000
GulfMark Term Loan Facility | GulfMark |  |
Business Acquisition [Line Items] |  |
Repayment of outstanding term loan facility |  | $ 28,000
GulfMark |  |
Business Acquisition [Line Items] |  |
Business acquisition, name of acquired entity |  | GulfMark Offshore, Inc.
Business acquisition, effective date of acquisition |  | Nov. 15, 2018
Business acquisition, date of acquisition agreement |  | Jul. 15, 2018
Total revenues |  | $ 12,700
Net loss |  | $ 30,600
Business combination, stock conversion ratio |  | 1.10
Business combination, purchase consideration |  | $ 385,500
Number of property and equipment acquired in business combination | Vessel |  | 65
Property and equipment acquired in business combination |  | $ 360,701
Estimated remaining useful lives property and equipment |  | 1 to 18 years
Original remaining useful lives property and equipment |  | 20 years
GulfMark | GulfMark Term Loan Facility | General and Administrative Expense |  |
Business Acquisition [Line Items] |  |
Business combination related costs |  | $ 9,000

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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