Commitments and Contingencies	6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Environmental Remediation The Company elected to remediate environmental contamination discovered prior to the closing of the Texel acquisition in 2016 at a certain property in the province of Quebec, Canada (“the Property”) that was acquired by Lydall. The Company records accruals for environmental costs when such losses are probable and reasonably estimable. In 2016, the Company, through the engagement of a third-party environmental service firm, determined the final scope and timing of the remediation project and estimated the cost of the remediation project to range between $0.9 million and $1.5 million, which was further refined in July of 2017 to the top end of this range at $1.5 million and remains as the Company's best estimate as of June 30, 2018. During 2017, the environmental liability was reduced by $0.7 million, reflecting payments made to vendors, resulting in a balance of $0.8 million at December 31, 2017. During the six months ended June 30, 2018, the environmental liability was further reduced by $0.5 million, reflecting payments to vendors. The remaining balance for the environmental liability of $0.4 million (which remains fully offset as described below) is included within other long-term liabilities on the Company's balance sheet at June 30, 2018. Pursuant to the Share Purchase Agreement, ADS, Inc. ("ADS") has agreed to indemnify the Company from all costs and liabilities associated with the contamination and remediation work, including the costs of preparation and approval of the remediation plan and other reports in relation therewith. This indemnity was secured by an environmental escrow account, which was established in the amount of $3.0 million Canadian Dollars (approximately $2.3 million U.S. Dollars as of June 30, 2018). Prior to July 2018, for any costs and liabilities that exceeded the environmental escrow amount, the Company had access to the general indemnity escrow account, which was originally established in the amount of $14.0 million Canadian Dollars (approximately $10.7 million U.S. Dollars as of June 30, 2018). Based on the Share Purchase Agreement, the general indemnity escrow account was initially reduced to approximately $7.0 million Canadian Dollars (approximately $5.3 million U.S. Dollars as of June 30, 2018) on the first anniversary date of the closing date and then liquidated, in full on or about the second anniversary date of the closing date (i.e., July 9, 2018). Based on the foregoing, an indemnification asset of $0.9 million was also recorded in other assets at December 31, 2016, and subsequently increased to $1.5 million in July of 2017, as the Company believed, and still believes collection from ADS is probable. The indemnification asset was decreased by $0.7 million, reflecting indemnification from ADS for payments made by the Company to its vendors during 2017. During the six months ended June 30, 2018, the indemnification asset was further reduced by $0.5 million, reflecting indemnification from ADS for payments made by the Company to its vendors The resulting indemnification asset balance was $0.4 million at June 30, 2018. The accrual for remediation costs will be adjusted as further information develops, estimates change and payments to vendors are made for remediation, with an off-setting adjustment to the indemnification asset from ADS if collection is deemed probable. In the fourth quarter of 2016, as part of a groundwater discharging permitting process, water samples collected from wells and process water basins at the Company’s Rochester New Hampshire manufacturing facility, within the Performance Materials segment, showed concentrations of Perfluorinated Compounds (“PFCs”) in excess of state ambient groundwater quality standards. In January 2017, the Company received a notification from the State of New Hampshire Department of Environmental Services (“NHDES”) naming Lydall Performance Materials, Inc. a responsible party with respect to the discharge of regulated contaminants and, as such, is required to take action to investigate and remediate the impacts in accordance with standards established by the NHDES. The Company conducted a site investigation, the scope of which was reviewed by the NHDES, in order to assess the extent of potential soil and groundwater contamination and develop a remedial action. Based on input received from NHDES in March 2017 with regard to the scope of the site investigation, the Company recorded $0.2 million of expense in the first quarter of 2017 associated with the expected costs of conducting this site investigation. In the fourth quarter of 2017, the Company completed its state-approved site investigation report and submitted it to the NHDES. During the year ended December 31, 2017, the environmental liability of $0.2 million was reduced by $0.2 million reflecting payments made to vendors, resulting in no balance at December 31, 2017. In the first quarter of 2018, the Company received a response from the NHDES to the site investigation report outlining proposed remedial actions. The Company recorded $0.1 million of expense in the first quarter of 2018 associated with the expected costs to remediate the impacts of the discharge of regulated contaminants in accordance with standards established by the NHDES. In May of 2018, the Company met with the NHDES to finalize the proposed remedial actions from the site investigation report. The Company recorded a minimal incremental amount in the second quarter of 2018 associated with the cost of the proposed remedial actions resulting in an environmental liability of $0.1 million at June 30, 2018. Additionally, the Company expects to incur approximately $0.2 million of capital expenditures in 2018, which will be recorded as incurred, in relation to the lining of the Company's fresh water waste lagoons. While the site investigation is complete, the Company cannot be sure that costs will not exceed the current estimates until this matter is closed with the NHDES, nor that any future corrective action at this location would not have a material effect on the Company’s financial condition, results of operations or liquidity. Provisions for such matters are charged to expense when it is probable that a liability has been incurred and reasonable estimates of the liability can be made. Estimates of environmental liabilities are based on a variety of matters, including, but not limited to, the stage of investigation, the stage of the remedial design, evaluation of existing remediation technologies, and presently enacted laws and regulations. In future periods, a number of factors could significantly impact any estimates of environmental remediation costs.

Commitments and Contingencies

Environmental Remediation

The Company elected to remediate environmental contamination discovered prior to the closing of the Texel acquisition in 2016 at a certain property in the province of Quebec, Canada (“the Property”) that was acquired by Lydall. The Company records accruals for environmental costs when such losses are probable and reasonably estimable. In 2016, the Company, through the engagement of a third-party environmental service firm, determined the final scope and timing of the remediation project and estimated the cost of the remediation project to range between $0.9 million and $1.5 million, which was further refined in July of 2017 to the top end of this range at $1.5 million and remains as the Company's best estimate as of June 30, 2018. During 2017, the environmental liability was reduced by $0.7 million, reflecting payments made to vendors, resulting in a balance of $0.8 million at December 31, 2017. During the six months ended June 30, 2018, the environmental liability was further reduced by $0.5 million, reflecting payments to vendors. The remaining balance for the environmental liability of $0.4 million (which remains fully offset as described below) is included within other long-term liabilities on the Company's balance sheet at June 30, 2018.

Pursuant to the Share Purchase Agreement, ADS, Inc. ("ADS") has agreed to indemnify the Company from all costs and liabilities associated with the contamination and remediation work, including the costs of preparation and approval of the remediation plan and other reports in relation therewith. This indemnity was secured by an environmental escrow account, which was established in the amount of $3.0 million Canadian Dollars (approximately $2.3 million U.S. Dollars as of June 30, 2018). Prior to July 2018, for any costs and liabilities that exceeded the environmental escrow amount, the Company had access to the general indemnity escrow account, which was originally established in the amount of $14.0 million Canadian Dollars (approximately $10.7 million U.S. Dollars as of June 30, 2018). Based on the Share Purchase Agreement, the general indemnity escrow account was initially reduced to approximately $7.0 million Canadian Dollars (approximately $5.3 million U.S. Dollars as of June 30, 2018) on the first anniversary date of the closing date and then liquidated, in full on or about the second anniversary date of the closing date (i.e., July 9, 2018). Based on the foregoing, an indemnification asset of $0.9 million was also recorded in other assets at December 31, 2016, and subsequently increased to $1.5 million in July of 2017, as the Company believed, and still believes collection from ADS is probable. The indemnification asset was decreased by $0.7 million, reflecting indemnification from ADS for payments made by the Company to its vendors during 2017. During the six months ended June 30, 2018, the indemnification asset was further reduced by $0.5 million, reflecting indemnification from ADS for payments made by the Company to its vendors The resulting indemnification asset balance was $0.4 million at June 30, 2018. The accrual for remediation costs will be adjusted as further information develops, estimates change and payments to vendors are made for remediation, with an off-setting adjustment to the indemnification asset from ADS if collection is deemed probable.

In the fourth quarter of 2016, as part of a groundwater discharging permitting process, water samples collected from wells and process water basins at the Company’s Rochester New Hampshire manufacturing facility, within the Performance Materials segment, showed concentrations of Perfluorinated Compounds (“PFCs”) in excess of state ambient groundwater quality standards.

In January 2017, the Company received a notification from the State of New Hampshire Department of Environmental Services (“NHDES”) naming Lydall Performance Materials, Inc. a responsible party with respect to the discharge of regulated contaminants and, as such, is required to take action to investigate and remediate the impacts in accordance with standards established by the NHDES. The Company conducted a site investigation, the scope of which was reviewed by the NHDES, in order to assess the extent of potential soil and groundwater contamination and develop a remedial action. Based on input received from NHDES in March 2017 with regard to the scope of the site investigation, the Company recorded $0.2 million of expense in the first quarter of 2017 associated with the expected costs of conducting this site investigation.

In the fourth quarter of 2017, the Company completed its state-approved site investigation report and submitted it to the NHDES. During the year ended December 31, 2017, the environmental liability of $0.2 million was reduced by $0.2 million reflecting payments made to vendors, resulting in no balance at December 31, 2017.

In the first quarter of 2018, the Company received a response from the NHDES to the site investigation report outlining proposed remedial actions. The Company recorded $0.1 million of expense in the first quarter of 2018 associated with the expected costs to remediate the impacts of the discharge of regulated contaminants in accordance with standards established by the NHDES.

In May of 2018, the Company met with the NHDES to finalize the proposed remedial actions from the site investigation report. The Company recorded a minimal incremental amount in the second quarter of 2018 associated with the cost of the proposed remedial actions resulting in an environmental liability of $0.1 million at June 30, 2018. Additionally, the Company expects to incur approximately $0.2 million of capital expenditures in 2018, which will be recorded as incurred, in relation to the lining of the Company's fresh water waste lagoons.

While the site investigation is complete, the Company cannot be sure that costs will not exceed the current estimates until this matter is closed with the NHDES, nor that any future corrective action at this location would not have a material effect on the Company’s financial condition, results of operations or liquidity. Provisions for such matters are charged to expense when it is probable that a liability has been incurred and reasonable estimates of the liability can be made. Estimates of environmental liabilities are based on a variety of matters, including, but not limited to, the stage of investigation, the stage of the remedial design, evaluation of existing remediation technologies, and presently enacted laws and regulations. In future periods, a number of factors could significantly impact any estimates of environmental remediation costs.