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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