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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2020
May 07, 2020
Cover [Abstract]    
Entity Registrant Name KIRBY CORP  
Entity Central Index Key 0000056047  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   60,038,000
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description After the Company filed the original Form 10-Q, the Company determined that its results reported for the quarter ended March 31, 2020 in the Original Form 10-Q included a goodwill impairment expense that was understated as a result of not applying a specific provision of the Accounting Standards Update 2017-04, “Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”) which was adopted by the Company on January 1, 2020. ASU 2017-04 requires goodwill impairment be measured as the excess of the carrying value of the reporting unit over the estimated fair value. Pursuant to paragraph 350-20-55-23A, the recognition of an impairment of goodwill loss creates a cycle of impairment because the decrease in book value of goodwill increases the deferred tax assets (or decreases the deferred tax liabilities), when tax-deductible goodwill is involved, such that the carrying amount of the reporting unit immediately exceeds its fair value upon recognition of the loss. As a result, a simultaneous equation prescribed by the accounting literature should be applied, which the Company did not apply. The condensed financial statements for the quarter ended March 31, 2020 included in this Form 10-Q/A have been restated to apply this equation of the new guidance in ASU 2017-04, and the Company increased its goodwill impairment charge in the three months ending March 31, 2020 by $127,933,000 before taxes, $98,773,000 after taxes or $1.65 per share resulting in total impairments and other charges of $561,274,000 before taxes, $433,341,000 after taxes or $7.24 per share. This adjustment does not affect previously reported cash flows or revenues, nor does it affect segment profit of the marine transportation or distribution and services segments reported for the quarter ended March 31, 2020. A detail of all adjustments recorded is included in Note 1, Basis for Preparation of the Condensed Financial Statements.  
Document Period End Date Mar. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 1-7615  
Entity Tax Identification Number 74-1884980  
Entity Incorporation, State or Country Code NV  
Entity Address, Address Line One 55 Waugh Drive, Suite 1000  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77007  
City Area Code 713  
Local Phone Number 435-1000  
Title of 12(b) Security Common Stock  
Trading Symbol KEX  
Security Exchange Name NYSE