Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Employment – related liabilities	$ 8,643	$ 10,667
Capital loss carryforwards	316	305
Asbestos-related liability	17,963	18,894
Net operating loss – domestic	8,929	3,936
Net operating loss – state	4,014	3,057
Net operating loss – foreign	10,256	9,514
Inventory related	2,100	3,905
Impairment charge associated with investment in MG	1,043	1,050
Operating lease right-of-use assets	1,388	0
Other	3,476	3,352
Gross deferred income tax assets	70,691	64,203
Valuation allowance	(43,671)	(33,881)
Deferred tax assets, net, Total	27,020	30,322
Liabilities:
Depreciation	(21,741)	(25,420)
Intangible assets – finite life	(830)	(1,181)
Intangible assets – indefinite life	(492)	(550)
Operating lease liabilities	(1,388)	0
Other	(115)	(147)
Gross deferred income tax liabilities	(24,566)	(27,298)
Net deferred income tax assets	2,454	3,024
Foreign Tax Authority [Member]
Assets:
Pension liability	958	996
Domestic Tax Authority [Member]
Assets:
Pension liability	$ 11,605	$ 8,527