Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Employment - related liabilities	$ 18,659	$ 9,644
Liabilities related to discontinued operations	241	704
Capital loss carryforwards	282	223
Asbestos-related liability	21,024	16,356
Net operating loss - domestic	653	0
Net operating loss - state	2,123	1,445
Net operating loss - foreign	19,106	0
Inventory related	2,157	4,292
Impairment charge associated with investment in UES-MG	2,184	2,298
Investment tax credits - foreign	791	0
Other	6,660	3,311
Gross deferred income tax assets	92,254	54,029
Valuation allowance	(45,449)	(2,481)
Deferred tax assets, net, Total	46,805	51,548
Liabilities:
Depreciation	(37,584)	(29,223)
Mark-to-market adjustment - derivatives	(187)	(40)
Intangible assets - definite life	(2,067)	0
Intangible assets - indefinite life	(731)	0
Other	(2,003)	(1,716)
Gross deferred income tax liabilities	(42,572)	(30,979)
Net deferred income tax assets	4,233	20,569
Foreign Tax Authority [Member]
Assets:
Pension liability	2,241	2,822
Domestic Tax Authority [Member]
Assets:
Pension liability	$ 16,133	$ 12,934