Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policy Earning Per Common Share (Details)

v3.2.0.727
Basis of Presentation and Accounting Policy Earning Per Common Share (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Net Income (Loss) attributable to SEACOR Holdings Inc. $ 687,000 $ 21,067,000 $ (18,882,000) $ 32,576,000  
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units 0 0 0 0  
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities 0 3,148,000 0 6,287,000  
Net Income (Loss) Available to Common Stockholders, Diluted $ 687,000 $ 24,215,000 $ (18,882,000) $ 38,863,000  
Weighted Average Number of Shares Outstanding, Basic 17,780,759 19,989,402 17,779,250 20,049,056  
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 301,705 394,567 0 416,288  
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 0 4,200,525 0 4,200,525  
Weighted Average Number of Shares Outstanding, Diluted 18,082,464 24,584,494 17,779,250 24,665,869  
Earnings Per Share, Basic $ 0.04 $ 1.05 $ (1.06) $ 1.62  
Earnings Per Share, Diluted $ 0.04 $ 0.98 $ (1.06) $ 1.58  
Stock Compensation Plan [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 685,645 365,398   288,510 2,017,788
Three Point Zero Percentage Convertible Notes [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     1,825,326    
Two Point Five Percentage Convertible Notes [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     4,200,525