Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Tax effect of temporary differences related to:
Inventories	$ 500	$ 500
Accrued OPEB costs	1,000	1,100
Accrued pension costs	4,200	4,600
Accrued employee benefits	1,900	2,000
Accrued environmental liabilities	41,100	39,900
Other accrued liabilities and deductible differences	200	400
Tax loss and tax credit carryforwards		500
Adjusted gross deferred tax assets (liabilities)	48,900	49,000
Netting of items by tax jurisdiction	(48,900)	(49,000)
Marketable securities	(17,000)	(6,400)
Property and equipment	(4,400)	(4,500)
Goodwill	(2,600)	(2,600)
Other taxable differences	(3,300)	(4,300)
Investment in Kronos Worldwide, Inc.	(49,000)	(56,200)
Adjusted gross deferred tax assets (liabilities)	(76,300)	(74,000)
Netting of items by tax jurisdiction	48,900	49,000
Net noncurrent deferred tax asset (liability)	$ (27,445)	$ (25,035)