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Separate Financial Information of Guarantor Subsidiaries Condensed Consolidated Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Net Earnings (Loss) Including Noncontrolling Interest $ 3,300 $ (3,957)
Other Comprehensive Income (Loss):    
Foreign currency translation adjustments 8,381 2,400
Pension and retiree medical benefits 82 10
Cash flow hedge (2,715) (73)
Income Taxes:    
Foreign currency translation adjustments (17) 0
Pension and retiree medical benefits (151) (18)
Cash flow hedge (501) 27
Total Other Comprehensive Income, net of tax 5,079 2,346
Total Comprehensive Income (Loss) Including Noncontrolling Interest 8,379 (1,611)
Comprehensive Income Attributable to Noncontrolling Interest 26 0
Comprehensive Income (Loss) Attributable to Tennant Company 8,353 (1,611)
Eliminations    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Net Earnings (Loss) Including Noncontrolling Interest (6,353) (2,404)
Other Comprehensive Income (Loss):    
Foreign currency translation adjustments (7,689) 20,596
Pension and retiree medical benefits (19) 0
Cash flow hedge 0 0
Income Taxes:    
Foreign currency translation adjustments 16 0
Pension and retiree medical benefits 0 14
Cash flow hedge 0 0
Total Other Comprehensive Income, net of tax (7,692) 20,610
Total Comprehensive Income (Loss) Including Noncontrolling Interest (14,045)  
Comprehensive Income Attributable to Noncontrolling Interest (26)  
Comprehensive Income (Loss) Attributable to Tennant Company (14,019) 18,206
Parent    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Net Earnings (Loss) Including Noncontrolling Interest 3,300 (3,957)
Other Comprehensive Income (Loss):    
Foreign currency translation adjustments 8,381 2,400
Pension and retiree medical benefits 82 10
Cash flow hedge (2,715) (73)
Income Taxes:    
Foreign currency translation adjustments (17) 0
Pension and retiree medical benefits (151) (18)
Cash flow hedge (501) 27
Total Other Comprehensive Income, net of tax 5,079 2,346
Total Comprehensive Income (Loss) Including Noncontrolling Interest 8,379  
Comprehensive Income Attributable to Noncontrolling Interest 26  
Comprehensive Income (Loss) Attributable to Tennant Company 8,353 (1,611)
Guarantor Subsidiaries    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Net Earnings (Loss) Including Noncontrolling Interest 2,980 3,446
Other Comprehensive Income (Loss):    
Foreign currency translation adjustments (164) 101
Pension and retiree medical benefits 0 0
Cash flow hedge 0 0
Income Taxes:    
Foreign currency translation adjustments 0 0
Pension and retiree medical benefits 0 0
Cash flow hedge 0 0
Total Other Comprehensive Income, net of tax (164) 101
Total Comprehensive Income (Loss) Including Noncontrolling Interest 2,816  
Comprehensive Income Attributable to Noncontrolling Interest 0  
Comprehensive Income (Loss) Attributable to Tennant Company 2,816 3,547
Non-Guarantor Subsidiaries    
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]    
Net Earnings (Loss) Including Noncontrolling Interest 3,373 (1,042)
Other Comprehensive Income (Loss):    
Foreign currency translation adjustments 7,853 (20,697)
Pension and retiree medical benefits 19 0
Cash flow hedge 0 0
Income Taxes:    
Foreign currency translation adjustments (16) 0
Pension and retiree medical benefits 0 (14)
Cash flow hedge 0 0
Total Other Comprehensive Income, net of tax 7,856 (20,711)
Total Comprehensive Income (Loss) Including Noncontrolling Interest 11,229  
Comprehensive Income Attributable to Noncontrolling Interest 26  
Comprehensive Income (Loss) Attributable to Tennant Company $ 11,203 $ (21,753)