Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.19.2
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 19, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 1-12289  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 13-3542736  
Entity Address, Address Line One 2200 Eller Drive, P.O. Box 13038,  
Entity Address, City or Town Fort Lauderdale  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33316  
City Area Code 954  
Local Phone Number 523-2200  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol CKH  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   18,549,972
Entity Registrant Name SEACOR HOLDINGS INC /NEW/  
Entity Central Index Key 0000859598  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false