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Document And Entity Information
 3 Months Ended
Mar. 31, 2012
Document and Entity Information [Abstract]  
Entity Registrant Name GORMAN RUPP CO
Document Type 10-Q
Current Fiscal Year End Date --12-31
Entity Common Stock, Shares Outstanding 20,990,893
Amendment Flag false
Entity Central Index Key 0000042682
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Filer Category Accelerated Filer
Entity Well-known Seasoned Issuer No
Document Period End Date Mar. 31, 2012
Document Fiscal Year Focus 2012
Document Fiscal Period Focus Q1