Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Employment - related liabilities	$ 10,726	$ 11,946
Liabilities related to discontinued operations	733	959
Capital loss carryforwards	253	273
Asbestos-related liability	18,252	18,172
Net operating loss - state	2,029	1,654
Inventory related	3,458	2,644
Impairment charge associated with investment in UES-MG	2,344	2,316
Other	3,546	3,939
Gross deferred income tax assets	61,231	49,474
Valuation allowance	(3,254)	(2,639)
Deferred tax assets, net, Total	57,977	46,835
Liabilities:
Depreciation	(30,429)	(31,918)
Mark-to-market adjustment - derivatives	(23)	(73)
Other	(1,993)	(2,495)
Gross deferred income tax liabilities	(32,445)	(34,486)
Net deferred income tax assets	25,532	12,349
Foreign Tax Authority [Member]
Assets:
Pension liability	4,041	2,434
Domestic Tax Authority [Member]
Assets:
Pension liability	$ 15,849	$ 5,137