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Employee and Non-Employee Benefit Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 23, 2015
May. 28, 2015
Sep. 30, 2015
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 01, 2015
Feb. 27, 2015
Dec. 31, 2014
May. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Other comprehensive income (loss) reclassification of defined benefit plan prior service cost and net actuarial loss         $ 45 $ 345        
Other comprehensive income (loss), reclassification of net actuarial loss from accumulated other comprehensive loss into pension benefit income         404 $ 15        
Change in pension plans, net of tax [1]         (243)          
Other current liabilities     $ 0   $ 0       $ 716  
Employer contributions to 401 (k)     $ 117              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares authorized (in shares)     40,000,000   40,000,000       40,000,000  
Stock repurchase program, authorized shares             950,000      
Stock repurchase program, price per share (in dollars per share)             $ 15.25      
Treasury stock value, at cost     $ 16,038   $ 16,038   $ 14,488   $ 980  
Stock repurchase program, authorized amount               $ 3,500    
ICP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Equity method ownership percentage (percent)     30.00%   30.00%          
SEACOR Holdings, Inc. [Member] | ICP [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Equity method ownership percentage (percent)     70.00%   70.00%          
The 2014 Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)     1,500,000   1,500,000          
Directors Option Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)     300,000   300,000          
Unexercised awards (in shares)     4,000   4,000          
Grants in period (in shares)         31,983          
Employee Stock Purchase Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)                   300,000
Minimum [Member] | Non-Employee Director Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         1 year          
Restricted Stock Units (RSUs) [Member] | The 2014 Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Grants in period (in shares)         101,702          
RSUs forfeited for termination of employment (in shares)         6,256          
Restricted Stock Units (RSUs) [Member] | Employee Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         3 years          
Restricted Stock and Restricted Stock Units [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested awards (in shares)     561,446   561,446          
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock         128,500          
Chief Financial Officer [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Restricted stock vested (in shares)   13,585                
Vice President [Member] | Restricted Stock Units (RSUs) [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested awards (in shares) 29,941                  
Accelerated share-based compensation expense $ 195                  
Vice President [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unvested awards (in shares) 16,500                  
Accumulated Other Comprehensive Loss                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Change in pension plans, net of tax [1]         $ (243)          
Selling, General and Administrative Expenses [Member] | Chief Financial Officer [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation expense   $ 231                
Post Retirement Health Care And Life Benefits [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined benefit plan, contributions by employer     $ 114              
Pension Plan [Member]                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                    
Defined benefit plan, contributions by employer       $ 741            
[1] See Note 9. Employee and Non-Employee Benefit Plans for amounts reclassified from Accumulated Other Comprehensive Loss.