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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Noncontrolling Interests [Member]
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of adoption | ASU 2016-09 [Member]       $ 0      
Cumulative effect of adoption | ASU 2014-09 [Member]       0      
Cumulative effect of adoption | ASU 2018-02 [Member]     $ 0 0      
Balance at beginning of year at Dec. 31, 2015 $ 5,978 $ 434,783 (44,686) 2,200,830 $ (328,094) $ 10,385  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of shares in acquisition 0 0          
(Deficit) of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued   (755)          
Tax expense realized from equity compensation plans   (824)          
Issuance of restricted stock, net of forfeitures   (10,218)          
Amortization of unearned compensation   11,675          
Acquisitions of noncontrolling interests   (2,202)       (6,258)  
Net earnings attributable to Kirby for the year       141,406     $ 141,406
Purchase of treasury stock (11,000 in 2018 and 35,000 in 2016)         (1,827)    
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016)         9,573    
Net earnings attributable to noncontrolling interests           1,398 1,398
Return of investment to noncontrolling interests           (1,976) 1,976
Other comprehensive income (loss), net of taxes     (6,321)       (6,321)
Balance at end of year at Dec. 31, 2016 5,978 432,459 (51,007) 2,342,236 (320,348) 3,549  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of adoption | ASU 2016-09 [Member]       (8,486)      
Cumulative effect of adoption | ASU 2014-09 [Member]       0      
Cumulative effect of adoption | ASU 2018-02 [Member]     0 0      
Issuance of shares in acquisition 569 365,985          
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued   833          
Tax expense realized from equity compensation plans   0          
Issuance of restricted stock, net of forfeitures   (7,770)          
Amortization of unearned compensation   11,460          
Acquisitions of noncontrolling interests   (6)       0  
Net earnings attributable to Kirby for the year       313,187     313,187
Purchase of treasury stock (11,000 in 2018 and 35,000 in 2016)         0    
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016)         7,128    
Net earnings attributable to noncontrolling interests           716 716
Return of investment to noncontrolling interests           (862) 862
Other comprehensive income (loss), net of taxes     18,602       18,602
Balance at end of year at Dec. 31, 2017 6,547 802,961 (32,405) 2,646,937 (313,220) 3,403 3,114,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of adoption | ASU 2016-09 [Member]       0      
Cumulative effect of adoption | ASU 2014-09 [Member]       (9,722)      
Cumulative effect of adoption | ASU 2018-02 [Member]     (7,925) 7,925      
Issuance of shares in acquisition 0 0          
Excess of proceeds received upon exercise of stock options and issuance of restricted stock over cost of treasury stock issued   3,489          
Tax expense realized from equity compensation plans   0          
Issuance of restricted stock, net of forfeitures   (2,207)          
Amortization of unearned compensation   19,104          
Acquisitions of noncontrolling interests   0       0  
Net earnings attributable to Kirby for the year       78,452     78,452
Purchase of treasury stock (11,000 in 2018 and 35,000 in 2016)         (776)    
Cost of treasury stock issued upon exercise of stock options and issuance of restricted stock (186,000 in 2018, 138,000 in 2017 and 170,000 in 2016)         7,208    
Net earnings attributable to noncontrolling interests           626 626
Return of investment to noncontrolling interests           (915) 915
Other comprehensive income (loss), net of taxes     6,819       (1,106)
Balance at end of year at Dec. 31, 2018 $ 6,547 $ 823,347 $ (33,511) 2,723,592 $ (306,788) $ 3,114 3,216,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of adoption | ASU 2014-09 [Member]       $ 9,722     $ 9,722