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Separate Financial Information of Guarantor Subsidiaries Statements of Earnings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]                      
Net Sales $ 279,295 $ 261,921 $ 270,791 $ 191,059 $ 211,746 $ 200,134 $ 216,828 $ 179,864 $ 1,003,066 $ 808,572 $ 811,799
Cost of Sales                 598,645 456,977 462,739
Gross Profit 115,527 104,604 104,554 79,736 93,509 85,295 95,289 77,502 404,421 351,595 349,060
Operating Expense:                      
Research and Development Expense                 32,013 34,738 32,415
Selling and Administrative Expense                 345,364 248,210 252,270
Loss on Sale of Business                 0 149 0
Impairment of Long-Lived Assets                     11,199
Operating Expenses                 377,377 283,097 295,884
Profit (Loss) from Operations                 27,044 68,498 53,176
Other Income and Expenses [Abstract]                      
Equity in Earnings of Affiliates                 0 0 0
Interest (Expense) Income, Net                 (22,989) (949) (1,141)
Intercompany Interest Income (Expense)                 0 0 0
Net Foreign Currency Transaction Losses                 (3,387) (392) (954)
Other Expense, Net                 (1,960) (666) (657)
Nonoperating Income (Expense)                 (28,336) (2,007) (2,752)
Profit (Loss) Before Income Taxes                 (1,292) 66,491 50,424
Income Tax Expense                 4,913 19,877 18,336
Net (Loss) Earnings Including Noncontrolling Interest                 (6,205) 46,614 32,088
Net Loss Attributable to Noncontrolling Interest                 (10) 0 0
Net (Loss) Earnings Attributable to Tennant Company $ (3,206) $ 3,559 $ (2,591) $ (3,957) $ 15,370 $ 11,477 $ 15,328 $ 4,439 (6,195) 46,614 32,088
Parent Company                      
Debt Instrument [Line Items]                      
Net Sales                 454,703 455,375 480,418
Cost of Sales                 311,897 299,459 320,620
Gross Profit                 142,806 155,916 159,798
Operating Expense:                      
Research and Development Expense                 27,219 32,378 29,888
Selling and Administrative Expense                 116,388 95,189 97,301
Loss on Sale of Business                   (82)  
Impairment of Long-Lived Assets                     0
Operating Expenses                 143,607 127,485 127,189
Profit (Loss) from Operations                 (801) 28,431 32,609
Other Income and Expenses [Abstract]                      
Equity in Earnings of Affiliates                 12,754 34,068 14,766
Interest (Expense) Income, Net                 (22,659) (1,204) (1,221)
Intercompany Interest Income (Expense)                 12,519 7,157 7,368
Net Foreign Currency Transaction Losses                 857 648 535
Other Expense, Net                 (3,962) (2,609) (3,633)
Nonoperating Income (Expense)                 (491) 38,060 17,815
Profit (Loss) Before Income Taxes                 (1,292) 66,491 50,424
Income Tax Expense                 4,913 19,877 18,336
Net (Loss) Earnings Including Noncontrolling Interest                 (6,205) 46,614 32,088
Net Loss Attributable to Noncontrolling Interest                 (10)    
Net (Loss) Earnings Attributable to Tennant Company                 (6,195) 46,614 32,088
Guarantor Subsidiaries                      
Debt Instrument [Line Items]                      
Net Sales                 594,405 587,815 586,154
Cost of Sales                 488,972 483,075 489,203
Gross Profit                 105,433 104,740 96,951
Operating Expense:                      
Research and Development Expense                 315 429 389
Selling and Administrative Expense                 78,516 74,643 72,954
Loss on Sale of Business                   0  
Impairment of Long-Lived Assets                     0
Operating Expenses                 78,831 75,072 73,343
Profit (Loss) from Operations                 26,602 29,668 23,608
Other Income and Expenses [Abstract]                      
Equity in Earnings of Affiliates                 2,004 2,192 2,122
Interest (Expense) Income, Net                 0 0 0
Intercompany Interest Income (Expense)                 (5,776) (5,570) (5,400)
Net Foreign Currency Transaction Losses                 0 (652) (777)
Other Expense, Net                 (736) (573) (422)
Nonoperating Income (Expense)                 (4,508) (4,603) (4,477)
Profit (Loss) Before Income Taxes                 22,094 25,065 19,131
Income Tax Expense                 8,070 9,443 4,619
Net (Loss) Earnings Including Noncontrolling Interest                 14,024 15,622 14,512
Net Loss Attributable to Noncontrolling Interest                 0    
Net (Loss) Earnings Attributable to Tennant Company                 14,024 15,622 14,512
Non-Guarantor Subsidiaries                      
Debt Instrument [Line Items]                      
Net Sales                 471,559 290,349 306,506
Cost of Sales                 317,151 199,336 213,085
Gross Profit                 154,408 91,013 93,421
Operating Expense:                      
Research and Development Expense                 4,479 1,931 2,138
Selling and Administrative Expense                 150,460 78,378 82,015
Loss on Sale of Business                   231  
Impairment of Long-Lived Assets                     11,199
Operating Expenses                 154,939 80,540 95,352
Profit (Loss) from Operations                 (531) 10,473 (1,931)
Other Income and Expenses [Abstract]                      
Equity in Earnings of Affiliates                 28,855 0 0
Interest (Expense) Income, Net                 (299) 255 80
Intercompany Interest Income (Expense)                 (6,743) (1,587) (1,968)
Net Foreign Currency Transaction Losses                 (4,244) (388) (712)
Other Expense, Net                 2,841 2,516 3,398
Nonoperating Income (Expense)                 20,410 796 798
Profit (Loss) Before Income Taxes                 19,879 11,269 (1,133)
Income Tax Expense                 (98) 2,427 1,630
Net (Loss) Earnings Including Noncontrolling Interest                 19,977 8,842 (2,763)
Net Loss Attributable to Noncontrolling Interest                 (10)    
Net (Loss) Earnings Attributable to Tennant Company                 19,987 8,842 (2,763)
Consolidation, Eliminations                      
Debt Instrument [Line Items]                      
Net Sales                 (517,601) (524,967) (561,279)
Cost of Sales                 (519,375) (524,893) (560,169)
Gross Profit                 1,774 (74) (1,110)
Operating Expense:                      
Research and Development Expense                 0 0 0
Selling and Administrative Expense                 0 0 0
Loss on Sale of Business                   0  
Impairment of Long-Lived Assets                     0
Operating Expenses                 0 0 0
Profit (Loss) from Operations                 1,774 (74) (1,110)
Other Income and Expenses [Abstract]                      
Equity in Earnings of Affiliates                 (43,613) (36,260) (16,888)
Interest (Expense) Income, Net                 (31) 0 0
Intercompany Interest Income (Expense)                 0 0 0
Net Foreign Currency Transaction Losses                 0 0 0
Other Expense, Net                 (103) 0 0
Nonoperating Income (Expense)                 (43,747) (36,260) (16,888)
Profit (Loss) Before Income Taxes                 (41,973) (36,334) (17,998)
Income Tax Expense                 (7,972) (11,870) (6,249)
Net (Loss) Earnings Including Noncontrolling Interest                 (34,001) (24,464) (11,749)
Net Loss Attributable to Noncontrolling Interest                 10    
Net (Loss) Earnings Attributable to Tennant Company                 $ (34,011) $ (24,464) $ (11,749)