Annual report pursuant to section 13 and 15(d)

Document And Entity Information

v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended
Dec. 31, 2012
Feb. 25, 2013
Jun. 30, 2012
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2012    
Document Fiscal Year Focus 2012    
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 Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   19,886,116  
Entity Public Float     $ 1,751,994,315