Commitments and Contingencies - Additional Information (Detail)		1 Months Ended	12 Months Ended			192 Months Ended
	Oct. 03, 2014 USD ($)	Oct. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Case	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2017 USD ($) Case	Dec. 31, 2016 Case
Loss Contingencies [Line Items]
Cumulative settlement payments for cases involving asbestos-related claims		$ 500,000		$ 200,000	$ 500,000	$ 1,300,000
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses						1,200,000
Average cost per settled claim excluding legal fees			$ 28,000			$ 28,000
Number of claims pending | Case			218			218	229
Number of new cases filed | Case			51
Number of cases dismissed | Case			56
Number of cases settled | Case			6
Settlement recovering expense					200,000
Loss amount awarded for damage	$ 600,000
Loss amount not paid under the contract	$ 200,000
Loss contingency settlement terms			After a trial in 2015, the Court issued Findings of Fact and Conclusions of Law that provide that we breached our contract with Viron and that Viron is entitled to damages in the amount of approximately $0.6 million plus attorneys’ fees. Additionally, the Court concluded that we are not entitled to an offset for the invoiced amounts of $0.2 million not paid by Viron under the contract.
Cumulative settlement paid for cases involving asbestos-related claims				$ 200,000
Assessment regarding Loss contingency impact Description			We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.
Previously Reported [Member]
Loss Contingencies [Line Items]
Cumulative settlement payments for cases involving asbestos-related claims					$ 300,000