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Separate Financial Information of Guarantor Subsidiaries Statements of Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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)

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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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