Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 22, 2016
Entity Registrant Name	GULFMARK OFFSHORE INC
Entity Central Index Key	0001030749
Trading Symbol	glf
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		25,790,430
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Amendment Flag	false