Annual report pursuant to section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2010
Feb. 18, 2011
Jun. 30, 2010
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2010
Document Fiscal Year Focus 2010    
Document Fiscal Period Focus FY    
Entity Registrant Name SEACOR HOLDINGS INC /NEW/    
Entity Central Index Key 0000859598    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   21,424,863  
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 1,408,828,407
Entity Current Reporting Status Yes    
Entity Voluntary Filers No