Other Events and Transactions (Discontinued Operation Results) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense		$ 0	$ 2,162
Income from discontinued operations		$ 0	1,874
HBBHC | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			474,971
Cost of goods sold			353,436
Gross profit			121,535
Operating expenses			114,379
Operating profit			7,156
Interest expense			1,300
Other expense, net			(939)
Income before income taxes			6,795
Income tax expense			2,655
HBBHC net income			4,140
NACCO expenses related to the spin-off			2,759
NACCO discontinued operations income tax expense (benefit) adjustments			(493)
Income from discontinued operations			$ 1,874
Spinoff | HBBHC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses related to the spin-off	$ 2,500