Contingencies	9 Months Ended
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Various legal and regulatory proceedings and claims have been or may be asserted against NACCO and certain subsidiaries relating to the conduct of their businesses, including product liability, patent infringement, asbestos-related claims, environmental and other claims. These proceedings and claims are incidental to the ordinary course of business of the Company. Management believes that it has meritorious defenses and will vigorously defend the Company in these actions. The Company's policy is to expense legal fees as services are rendered and to accrue for liabilities when losses are probable and reasonably estimable. Although the ultimate disposition of these proceedings is not presently determinable, management believes, after consultation with its legal counsel, that the likelihood is remote that material losses will be incurred in excess of accruals already recognized. HBB is investigating or remediating historical environmental contamination at some current and former sites operated by HBB or by businesses it acquired. Based on the current stage of the investigation or remediation at each known site, HBB estimates the total investigation and remediation costs and the period of assessment and remediation activity required for each site. The estimate of future investigation and remediation costs is primarily based on variables associated with site clean-up, including, but not limited to, physical characteristics of the site, the nature and extent of the contamination and applicable regulatory programs and remediation standards. No assessment can fully characterize all subsurface conditions at a site. There is no assurance that additional assessment and remediation efforts will not result in adjustments to estimated remediation costs or the time frame for remediation at these sites. HBB's estimates of investigation and remediation costs may change if it discovers contamination at additional sites or additional contamination at known sites, if the effectiveness of its current remediation efforts change, if applicable federal or state regulations change or if HBB's estimate of the time required to remediate the sites changes. HBB's revised estimates may differ materially from original estimates. At September 30, 2015, December 31, 2014 and September 30, 2014, HBB had accrued undiscounted obligations of $8.5 million, $9.7 million and $10.0 million, respectively, for environmental investigation and remediation activities. In addition, HBB estimates that it is reasonably possible that it may incur additional expenses in the range of zero to $4.7 million related to the environmental investigation and remediation at these sites. During the nine months ended September 30, 2014, HBB recorded a $3.3 million charge to increase the liability for environmental investigation and remediation activities at the Picton, Ontario facility as a result of an environmental study performed in the second quarter of 2014.

Contingencies

Various legal and regulatory proceedings and claims have been or may be asserted against NACCO and certain subsidiaries relating to the conduct of their businesses, including product liability, patent infringement, asbestos-related claims, environmental and other claims. These proceedings and claims are incidental to the ordinary course of business of the Company. Management believes that it has meritorious defenses and will vigorously defend the Company in these actions. The Company's policy is to expense legal fees as services are rendered and to accrue for liabilities when losses are probable and reasonably estimable. Although the ultimate disposition of these proceedings is not presently determinable, management believes, after consultation with its legal counsel, that the likelihood is remote that material losses will be incurred in excess of accruals already recognized.

HBB is investigating or remediating historical environmental contamination at some current and former sites operated by HBB or by businesses it acquired. Based on the current stage of the investigation or remediation at each known site, HBB estimates the total investigation and remediation costs and the period of assessment and remediation activity required for each site. The estimate of future investigation and remediation costs is primarily based on variables associated with site clean-up, including, but not limited to, physical characteristics of the site, the nature and extent of the contamination and applicable regulatory programs and remediation standards. No assessment can fully characterize all subsurface conditions at a site. There is no assurance that additional assessment and remediation efforts will not result in adjustments to estimated remediation costs or the time frame for remediation at these sites.

HBB's estimates of investigation and remediation costs may change if it discovers contamination at additional sites or additional contamination at known sites, if the effectiveness of its current remediation efforts change, if applicable federal or state regulations change or if HBB's estimate of the time required to remediate the sites changes. HBB's revised estimates may differ materially from original estimates.

At September 30, 2015, December 31, 2014 and September 30, 2014, HBB had accrued undiscounted obligations of $8.5 million, $9.7 million and $10.0 million, respectively, for environmental investigation and remediation activities. In addition, HBB estimates that it is reasonably possible that it may incur additional expenses in the range of zero to $4.7 million related to the environmental investigation and remediation at these sites. During the nine months ended September 30, 2014, HBB recorded a $3.3 million charge to increase the liability for environmental investigation and remediation activities at the Picton, Ontario facility as a result of an environmental study performed in the second quarter of 2014.